Interrupted apt, now cannot use Ubuntu 18.04 LTS

I am running dual boot Windows 10 and Ubuntu 18.04 LTS with NVIDIA GPU:s and stupidly forced my computer to shut down during an Ubuntu apt installation, as I mistook it for a crash (screen turned black followed by a terminal) without looking too much into it. Since this, I have not been able to use as the system freezes entirely when reaching the login screen (I am already using nomodeset). Booting into recovery mode from GRUB menu does not work either, it freezes upon getting the recovery menu.

Attempts of Fixing

To try to fix this, I managed to boot directly into a root bash session by pressing e in GRUB when booting Ubuntu and appending rw init=/bin/bash to the line beginning with linux. From here I was able to remove some unrelated datasets to free up space on my hard drive, and then ran dpkg --configure -a. After this, trying to boot my Ubuntu on my default latest kernel still does not work, but instead of freezing at login it stops at an initramfs terminal that says gave up waiting for root file system device.

After trying the suggested diagnostics given by initramfs, increasing rootdelay did not work, and /proc/modules was empty, and ls /dev did not show stuff like sda. No luck there.

I then tried to boot from a previous kernel (my latest kernel is 4.15.0.151 and the previous kernel is 4.15.0.147), and I do manage to not get stuck at initramfs, but now I again get a freeze at login. This is as far as I have gotten in trying to fix things, and hopefully it hasn’t ruined stuff for me. Booting recovery mode via the GRUB menu on this kernel still does not work, but booting directly to a root bash session works (have not tried gaining internet access in this root bash session, not sure how to do so).

Right now, I have managed to boot an 18.04 LTS installer from a USB. This does not have the option to reinstall with existing file system, but it does allow me to access the file system, which seems to work just fine. I was able to access logs for apt that occurred right before I first forced shut down during apt installations, and below are logs for the day of the apt install. Note that in both of these logs, at the end, they are interrupted. I also see that it was interrupted during nvidia updates, and that some initramfs was deferred but intended to be modified right before being interrupted (could explain the initramfs issues I am having when booting on 4.15.0.151).

Question

I am wondering if it is possible for me to save my existing Ubuntu installation, maybe by rolling back the apt installations or somehow restoring or fixing the initramfs stuff, or even just getting the previous kernel 4.15.0.147 to work?

Any help is greatly appreciated! Let me know if any other logs are needed.

Logs

/var/log/apt/term.log

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Setting up libnss-myhostname:amd64 (237-3ubuntu10.49) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
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Log ended: 2021-07-21  10:05:51

Log started: 2021-07-21  10:05:54
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Unpacking libnvidia-common-460 (460.91.03-0ubuntu0.18.04.1) over (460.80-0ubuntu0.18.04.2) ...
Setting up libnvidia-common-460 (460.91.03-0ubuntu0.18.04.1) ...
Log ended: 2021-07-21  10:05:55

Log started: 2021-07-21  10:05:58
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Setting up linux-libc-dev:amd64 (4.15.0-151.157) ...
Log ended: 2021-07-21  10:05:58

Log started: 2021-07-21  10:06:02
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Setting up linux-signed-generic (4.15.0.151.139) ...
Log ended: 2021-07-21  10:06:02

Log started: 2021-07-21  10:06:07
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Setting up systemd-sysv (237-3ubuntu10.49) ...
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Log ended: 2021-07-21  10:06:08

Log started: 2021-07-21  10:06:12
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Setting up libudev1:amd64 (237-3ubuntu10.49) ...
Setting up udev (237-3ubuntu10.49) ...
update-initramfs: deferring update (trigger activated)
Setting up libudev-dev:amd64 (237-3ubuntu10.49) ...
Processing triggers for libc-bin (2.27-3ubuntu1.4) ...
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Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for ureadahead (0.100.0-21) ...
ureadahead will be reprofiled on next reboot
Processing triggers for initramfs-tools (0.130ubuntu3.11) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-147-generic
Log ended: 2021-07-21  10:06:24

Log started: 2021-07-21  10:06:27
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Processing triggers for libc-bin (2.27-3ubuntu1.4) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for dbus (1.12.2-1ubuntu1.2) ...
Processing triggers for ureadahead (0.100.0-21) ...
Log ended: 2021-07-21  10:06:31

Log started: 2021-07-21  10:06:34
Selecting previously unselected package linux-modules-4.15.0-151-generic.
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Selecting previously unselected package linux-headers-4.15.0-151.
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Preparing to unpack .../7-linux-headers-generic_4.15.0.151.139_amd64.deb ...
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Setting up linux-modules-4.15.0-151-generic (4.15.0-151.157) ...
Setting up linux-headers-4.15.0-151 (4.15.0-151.157) ...
Setting up linux-headers-4.15.0-151-generic (4.15.0-151.157) ...
/etc/kernel/header_postinst.d/dkms:
 * dkms: running auto installation service for kernel 4.15.0-151-generic

Kernel preparation unnecessary for this kernel.  Skipping...
applying patch disable_fstack-clash-protection_fcf-protection.patch...patching file Kbuild
Hunk #1 succeeded at 82 (offset 11 lines).


Building module:
cleaning build area...
unset ARCH; ( ! -h /usr/bin/cc ) && export CC=/usr/bin/gcc; env NV_VERBOSE=1 'make' -j8 NV_EXCLUDE_BUILD_MODULES='' KERNEL_UNAME=4.15.0-151-generic IGNORE_XEN_PRESENCE=1 IGNORE_CC_MISMATCH=1 SYSSRC=/lib/modules/4.15.0-151-generic/build LD=/usr/bin/ld.bfd modules........
Signing module:
 - /var/lib/dkms/nvidia/460.80/4.15.0-151-generic/x86_64/module/nvidia.ko
 - /var/lib/dkms/nvidia/460.80/4.15.0-151-generic/x86_64/module/nvidia-drm.ko
 - /var/lib/dkms/nvidia/460.80/4.15.0-151-generic/x86_64/module/nvidia-modeset.ko
 - /var/lib/dkms/nvidia/460.80/4.15.0-151-generic/x86_64/module/nvidia-uvm.ko
Secure Boot not enabled on this system.
cleaning build area...

DKMS: build completed.

nvidia.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

nvidia-modeset.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

nvidia-drm.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

nvidia-uvm.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

depmod...

DKMS: install completed.

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
make -j8 KERNELRELEASE=4.15.0-151-generic -C /lib/modules/4.15.0-151-generic/build M=/var/lib/dkms/virtualbox/5.2.42/build.....
Signing module:
 - /var/lib/dkms/virtualbox/5.2.42/4.15.0-151-generic/x86_64/module/vboxnetadp.ko
 - /var/lib/dkms/virtualbox/5.2.42/4.15.0-151-generic/x86_64/module/vboxpci.ko
 - /var/lib/dkms/virtualbox/5.2.42/4.15.0-151-generic/x86_64/module/vboxdrv.ko
 - /var/lib/dkms/virtualbox/5.2.42/4.15.0-151-generic/x86_64/module/vboxnetflt.ko
Secure Boot not enabled on this system.
cleaning build area...

DKMS: build completed.

vboxdrv.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

vboxnetadp.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

vboxnetflt.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

vboxpci.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.0-151-generic/updates/dkms/

depmod...

DKMS: install completed.
   ...done.
Setting up linux-headers-generic (4.15.0.151.139) ...
Setting up linux-image-4.15.0-151-generic (4.15.0-151.157) ...
I: /vmlinuz.old is now a symlink to boot/vmlinuz-4.15.0-147-generic
I: /initrd.img.old is now a symlink to boot/initrd.img-4.15.0-147-generic
I: /vmlinuz is now a symlink to boot/vmlinuz-4.15.0-151-generic
I: /initrd.img is now a symlink to boot/initrd.img-4.15.0-151-generic
Setting up linux-modules-extra-4.15.0-151-generic (4.15.0-151.157) ...
Setting up linux-image-generic (4.15.0.151.139) ...
Setting up linux-generic (4.15.0.151.139) ...
Processing triggers for linux-image-4.15.0-151-generic (4.15.0-151.157) ...
/etc/kernel/postinst.d/dkms:
 * dkms: running auto installation service for kernel 4.15.0-151-generic
   ...done.
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-151-generic
/etc/kernel/postinst.d/zz-update-grub:
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-151-generic
Found initrd image: /boot/initrd.img-4.15.0-151-generic
Found linux image: /boot/vmlinuz-4.15.0-147-generic
Found initrd image: /boot/initrd.img-4.15.0-147-generic
Found linux image: /boot/vmlinuz-4.15.0-144-generic
Found initrd image: /boot/initrd.img-4.15.0-144-generic
Found Windows Boot Manager on /dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done
Log ended: 2021-07-21  10:07:32

Log started: 2021-07-21  10:07:36
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Removing all DKMS Modules
Done.
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Preparing to unpack .../11-libnvidia-ifr1-460_460.91.03-0ubuntu0.18.04.1_amd64.deb ...
Unpacking libnvidia-ifr1-460:amd64 (460.91.03-0ubuntu0.18.04.1) over (460.80-0ubuntu0.18.04.2) ...
Preparing to unpack .../12-libnvidia-fbc1-460_460.91.03-0ubuntu0.18.04.1_amd64.deb ...
Unpacking libnvidia-fbc1-460:amd64 (460.91.03-0ubuntu0.18.04.1) over (460.80-0ubuntu0.18.04.2) ...
Preparing to unpack .../13-xserver-xorg-video-nvidia-460_460.91.03-0ubuntu0.18.04.1_amd64.deb ...
Unpacking xserver-xorg-video-nvidia-460 (460.91.03-0ubuntu0.18.04.1) over (460.80-0ubuntu0.18.04.2) ...
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Unpacking libnvidia-cfg1-460:amd64 (460.91.03-0ubuntu0.18.04.1) over (460.80-0ubuntu0.18.04.2) ...
Setting up libnvidia-extra-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-fbc1-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-gl-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-ifr1-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-compute-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up nvidia-kernel-source-460 (460.91.03-0ubuntu0.18.04.1) ...
Setting up nvidia-utils-460 (460.91.03-0ubuntu0.18.04.1) ...
Setting up nvidia-kernel-common-460 (460.91.03-0ubuntu0.18.04.1) ...
update-initramfs: deferring update (trigger activated)
update-initramfs: Generating /boot/initrd.img-4.15.0-147-generic
Setting up libnvidia-cfg1-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-decode-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up nvidia-compute-utils-460 (460.91.03-0ubuntu0.18.04.1) ...
Setting up libnvidia-encode-460:amd64 (460.91.03-0ubuntu0.18.04.1) ...
Setting up xserver-xorg-video-nvidia-460 (460.91.03-0ubuntu0.18.04.1) ...
Setting up nvidia-dkms-460 (460.91.03-0ubuntu0.18.04.1) ...
update-initramfs: deferring update (trigger activated)
update-initramfs: Generating /boot/initrd.img-4.15.0-147-generic

/var/log/apt/history.log

Commandline: /usr/bin/unattended-upgrade
Upgrade: libnss-myhostname:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49)
End-Date: 2021-07-21  10:05:51

Start-Date: 2021-07-21  10:05:54
Commandline: /usr/bin/unattended-upgrade
Upgrade: libnvidia-common-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1)
End-Date: 2021-07-21  10:05:55

Start-Date: 2021-07-21  10:05:58
Commandline: /usr/bin/unattended-upgrade
Upgrade: linux-libc-dev:amd64 (4.15.0-147.151, 4.15.0-151.157)
End-Date: 2021-07-21  10:05:58

Start-Date: 2021-07-21  10:06:02
Commandline: /usr/bin/unattended-upgrade
Upgrade: linux-signed-generic:amd64 (4.15.0.147.134, 4.15.0.151.139)
End-Date: 2021-07-21  10:06:02

Start-Date: 2021-07-21  10:06:07
Commandline: /usr/bin/unattended-upgrade
Upgrade: systemd-sysv:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49)
End-Date: 2021-07-21  10:06:08

Start-Date: 2021-07-21  10:06:12
Commandline: /usr/bin/unattended-upgrade
Upgrade: udev:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49), libudev1:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49), libudev-dev:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49)
End-Date: 2021-07-21  10:06:24

Start-Date: 2021-07-21  10:06:27
Commandline: /usr/bin/unattended-upgrade
Upgrade: libsystemd0:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49), libpam-systemd:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49), systemd:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49), libnss-systemd:amd64 (237-3ubuntu10.44, 237-3ubuntu10.49)
End-Date: 2021-07-21  10:06:31

Start-Date: 2021-07-21  10:06:34
Commandline: /usr/bin/unattended-upgrade
Install: linux-headers-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-modules-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-image-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-modules-extra-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-headers-4.15.0-151:amd64 (4.15.0-151.157, automatic)
Upgrade: linux-headers-generic:amd64 (4.15.0.147.134, 4.15.0.151.139), linux-image-generic:amd64 (4.15.0.147.134, 4.15.0.151.139), linux-generic:amd64 (4.15.0.147.134, 4.15.0.151.139)
End-Date: 2021-07-21  10:07:32

Start-Date: 2021-07-21  10:07:36
Commandline: /usr/bin/unattended-upgrade
Upgrade: libnvidia-compute-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-encode-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-kernel-common-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), xserver-xorg-video-nvidia-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-gl-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-fbc1-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-decode-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-cfg1-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-utils-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-dkms-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-compute-utils-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-ifr1-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-driver-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), libnvidia-extra-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1), nvidia-kernel-source-460:amd64 (460.80-0ubuntu0.18.04.2, 460.91.03-0ubuntu0.18.04.1)```