Ubuntu 18.04 Desktop on VirtualBox – not showing desktop or anything just black screen after odoo installation

I have installed Ubuntu 18.04 Desktop edition on VirtualBox, working fine after guest edition installations from virtualbox too. I installed Odoo 14 using a guide, after successul it showing screen in browser to create first database. at that time I shutdown machine and then start it again but after booting (showing Ubuntu and some dots blow) it is not showing anything on screen, leave it for 10 minutes then used mouse to click, pressing enter key or any other key nothing happened. I have checked on 3 laptop machines and the same behaviour on all ( 1 is Lenovo and other 2 are different versions of HP ). Please help, no screenshot no log files etc. to submit here.
regards

usb – “[Errno 5] Input/output error” during ubuntu 20.04 installation

Error Description:
(Errno 5) Input/output error

This is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment.

Similar problem in history: https://www.reddit.com/r/linuxmint/comments/7qdc2q/errno_5_inputoutput_error_during_my_dual_boot/

My current dumb solution is writing a bootable dvd, bypassing rufus / unetbootin.
Can I have step-by-step working solution for creating bootable ubuntu 20.04 pendrive (in windows environment?)

https://ubuntu.com/tutorials/create-a-usb-stick-on-windows#10-installation-complete – this is not working. (it is bootable in live session though)
Rufus works with Linux Lite 5.2 so far.
Unetbootin works with previous Linux distros 14.10 and before.

Thanks in advance!

raspberrypi – After installing Ubuntu core on a Raspberry Pi Compute Module 3, I cannot overwrite with another image

I installed Ubuntu Core on a RPi compute module 3, and after that, I can’t overwrite it with another image.

After using the rpiboot utility to mount the disk as a local device, I cannot read or write this device any more.

I can use the same PC, cables, and development board to install images on a different compute module (not going to install Ubuntu Core again for now….)

The Ubuntu Core works OK, when allowed to boot on its own.

ubuntu – Can’t recieve emails with Postfix/Dovecot telnet returns status0

I try sending emails to my address and I can’t find any record of them, even in the logs. I can send to myself on the server just fine.
When I try telneting onto my server I get the following answer

enter image description here

When I telnet onto port 587 it works as expected.

Within the logs I get

warning: unexpected end-of-input from smtp socket while reading input attribute name
smtp socket: wanted attribute: flags
warning: deliver_request_get: error receiving common attributes

This is my postconf -M

smtp       inet  n       -       n       -       -       smtp -v
submission inet  n       -       n       -       -       smtpd -v -o syslog_name=postfix/submission -o smtpd_tls_security_level=encrypt -o smtpd_tls_cert_file=/etc/let                                                  sencrypt/live/gamesleeve.io/fullchain.pem -o smtpd_sasl_auth_enable=yes -o smtpd_reject_unlisted_recipient=no -o smtpd_relay_restrictions=permit_sasl_authenticated,rej                                                  ect -o milter_macro_daemon_name=ORIGINATING
pickup     unix  n       -       y       60      1       pickup
cleanup    unix  n       -       y       -       0       cleanup
qmgr       unix  n       -       n       300     1       qmgr
tlsmgr     unix  -       -       y       1000?   1       tlsmgr
rewrite    unix  -       -       y       -       -       trivial-rewrite
bounce     unix  -       -       y       -       0       bounce
defer      unix  -       -       y       -       0       bounce
trace      unix  -       -       y       -       0       bounce
verify     unix  -       -       y       -       1       verify
flush      unix  n       -       y       1000?   0       flush
proxymap   unix  -       -       n       -       -       proxymap
proxywrite unix  -       -       n       -       1       proxymap
smtp       unix  -       -       y       -       -       smtp
relay      unix  -       -       y       -       -       smtp -o syslog_name=postfix/$service_name
showq      unix  n       -       y       -       -       showq
error      unix  -       -       y       -       -       error
retry      unix  -       -       y       -       -       error
discard    unix  -       -       y       -       -       discard
local      unix  -       n       n       -       -       local
virtual    unix  -       n       n       -       -       virtual
lmtp       unix  -       -       y       -       -       lmtp
anvil      unix  -       -       y       -       1       anvil
scache     unix  -       -       y       -       1       scache
maildrop   unix  -       n       n       -       -       pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp       unix  -       n       n       -       -       pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail     unix  -       n       n       -       -       pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp      unix  -       n       n       -       -       pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix - n       n       -       2       pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman    unix  -       n       n       -       -       pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}

this is the postconf -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
compatibility_level = 2
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = ipv4
mailbox_size_limit = 0
mydestination = $myhostname,gamesleeve, gamesleeve.io,eiric.com, localhost.members,localhost
mydomain = gamesleeve.io
myhostname = mail.gamesleeve.io
mynetworks = 127.0.0.0/8 (::ffff:127.0.0.0)/104 (::1)/128
myorigin = gamesleeve.io
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
smtp_sasl_security_options =
smtp_tls_cert_file = /etc/letsencrypt/live/gamesleeve.io/fullchain.pem
smtp_tls_key_file = /etc/letsencrypt/live/gamesleeve.io/privkey.pem
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_tls_CAfile = /etc/letsencrypt/live/gamesleeve.io/chain.pem
smtpd_tls_cert_file = /etc/letsencrypt/live/gamesleeve.io/fullchain.pem
smtpd_tls_ciphers = high
smtpd_tls_key_file = /etc/letsencrypt/live/gamesleeve.io/privkey.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_domains = eiric.com
virtual_alias_maps = hash:/etc/postfix/virtual

I’ve doubled checked the MX records and it points to mail.gamesleeve.io with dig

ssd – Disk has 0 bytes free and now I can’t boot into Ubuntu

I was syncing photos and videos from my phone using SyncThing onto my laptop running Ubuntu 20.04.1.
The local SSD (/dev/sda2) was completely full so after copying to an external hard disk drive I deleted them from the local drive by pressing the delete key on the keyboard. I did not empty the trash afterwards.

Some time after that I restarted the machine. Now, instead of successfully booting it got to a message

/dev/sda2: clean, 367601/15597568 files, 59266164/6238360 blocks

My guess is somehow that the filesystem is so full, that the OS is unable to do what it needs to do to successfully boot.

So I booted using the Live USB that I had originally installed from, hoping to fix the issue. Once inside the live session I was hoping to do some kind of scan or delete some files to free up space on the local SSD. Unfortunately I do no have permissions to modify the SSD contents.

Any suggestions as to what I should try?

grub2 – Ubuntu 20.04.1 Slow (1 minute) Boot With Samsung 850 SSD

This is a clean install of 20.04.1 with no 3rd party packages on an old x58 (SATA II) system with no UEFI option. I initially created 1 OS 25GB partition and 1 Home partition with flags. Reinstalling with default partitions results in no change. No USB devices are attached aside from the keyboard and mouse. 18.04.4 was previously installed with a <10 second boot.

It takes 50 to 1:10:95 seconds as measured with a phone from the end of BIOS, to a purple GRUB screen, then the login screen. The bulk of the time (at least 50 seconds) is spent on the purple GRUB screen. An old Mushkin SSD using the same SATA cables with a clean 20.04.1 install boots in 8 seconds. SMART short, long, and fsck scans on the Samsung 850 SSD via a LiveUSB show no errors. I’ve long formatted the Samsung with EXT4 several times and updated the firmware. Benchmarks show 284.2 and 285.4 MB/s average read rate in 2 tests for the Samsung, which seems fine for SATA II.

Other things I’ve tried:

systemd-analyze blame showed 12.332s apt-daily.service as the worst offender, so I added the below to /etc/systemd/system/apt-daily.timer

# apt-daily timer configuration override
(Timer)
OnBootSec=5min
OnUnitActiveSec=1d
AccuracySec=1h
RandomizedDelaySec=7min

After this, systemd-analyze blame showed 4.912s NetworkManager-wait-online.service and 4.604s plymouth-quit-wait.service

Next steps: sudo systemctl disable NetworkManager-wait-online.service, removed splash from /etc/default/grub, and updated GRUB: sudo update-grub

Removing splash was significant, but nothing resulted in faster booting. Continuing on, I found that Quick Boot wasn’t enabled in BIOS, so that was enabled. fsck appeared to be running before the login screen on each boot. I then added fsck.mode=skip to GRUB_CMDLINE_LINUX_DEFAULT=

Used other 5.4 or 5.8 kernels, added nomodeset or noresume to GRUB, and changed the SATA port from 1 to 0 then reinstalled. Installing Linux Mint 20 has the same problem with a 1:08:58 second boot.

Updating, including the microcode, does nothing.

Commented out quiet splash via GRUB results in the usual loading messages after the same purple screen delay.

Removed plymouth.

Pressed ESC on the purple GRUB screen.

A clean 18.04.4 reinstall after all of this again gives a <10 second boot.

boot – Is there any way from within Ubuntu 20.10 to access blocked BIOS menu when the AMI BIOS says “EVALUATION COPY. NOT FOR SALE”

I have a Toshiba Satellite M500. AMI BIOS 1.40 is now protected by unknown password. Fastboot is enabled. I can access Ubuntu 20.10 bypassing BIOS by starting with INS key. I’m an 86 year old newbie who has been an Ubuntu user since 2007. Before Ubuntu, laptop had Vista and then Windows 7. I can’t change boot order if I can’t get into BIOS.