Customize the LiveCD background image, keyboard layout, network adapter drivers, and screen resolution

I have followed the instructions from https://help.ubuntu.com/community/LiveCDCustomization to adapt my first LiveCD based on ubuntu-18.04.2-desktop-amd64.iso (Note that all URI references refer to chapters of this tutorial.)
After testing the result, I found a few things where my customization did not seem to work:

  • Change that Desktop background to custom PNG: Although I added my wallpaper / usr / share / backgrounds / and modified /usr/share/gnome-background-properties/ubuntu-wallpapers.xml on my wallpaper instead of on warty-final ubuntu.pngThe wallpaper is still the warty-final ubuntu.png, The instructions say I should change some more files (see here), but I could not find them.

  • Change that Keyboard layout according to QWERTZ: In the manual there was a section on localization (see here). I could not find /usr/lib/ubiquity/ubiquity/misc.py (probably since I uninstalled ubiquity before) to adjust the layout.
    Do I have to install ubiquity to be able to preset the keyboard layout? I have uninstalled it, because I plan to use the created LiveCD only as a boot medium and not install Ubuntu on a computer.
    Also, I did not follow the UEFI boot instructions because I did not already execute the first command
    sed -i & # 39; 6i loadfont /boot/grub/fonts/unicode.pf2' boot / grub / grub.cfg ,
    Do I have to run the script for my LiveCD to work properly? What exactly am I adjusting here?

  • unreasonable screen size: When testing the created ISO with VirtualBox only a small 800×600 Screen is displayed. When launching on the latest Ubuntu LTS LiveCD I do not come across this fixed resolution.
    Does this also have to do with adapting the CD and how can I investigate where this problem comes from?

  • I skipped the whole thing Advanced customization Step. This step is not necessary at all, if I do not want to change anything here, right?

  • cleanup process: The "Clean Up" section of the manual states that after installing the software, I should do the following: rm / var / lib / dbus / machine ID and rm / sbin / initctl followed by
    dpkg-divert –rename –remove / sbin / initctl ,
    Do I have to execute these commands only if I have new software installed or if I am performing a suitable upgrade (this can also lead to the installation of new packages, right?)?

  • Find, install and test specific network drivers: Since my host system is not an Ubuntu operating system, I made the customization in a VirtualBox Ubuntu Guest system. I know from the past that the network adapter on my computer may not be recognized when the physical computer is booted with an Ubuntu LiveCD.
    I'm just wondering how to find out if this problem still exists without burning the CD.
    Is it possible for VirtualBox to delegate the network resource as it is to the guest to test if I need additional drivers?
    And how can I find out which drivers I might need to install?
    Once I know what to install, can I run apt install in the chroot environment to install the drivers as described in the APT section of the tutorial?

  • Since I'm not that familiar with Ubuntu, I'd be glad if your answers contain the instructions I should go to, as well as a rough explanation of what the instructions are for.

    35mm – Film Negative Scanning – Resolution, DPI and File Size

    dpi is about the inch … pixels per inch.

    4500 x 3000 pixels at 3200 dpi are 1.4 x 0.94 inches on the film.

    4500 x 3000 pixels at 360 dpi correspond to 12.5 x 8.33 inches on the printing paper. The distance and the size of the printed pixels. It should have also indicated the inch dimensions.

    This is a simple split …. 4500 pixels / 360 dpi = 12.5 inches.

    Exactly the same pixels, but on film or paper media simply scaled to different inch sizes. This is an extremely important basic principle of printing. Dpi is just a number that exists only when the inches are specified.

    At 4500 x 3000 pixels, the print size depends on the …
    For example, if dramatically at 100 dpi, it would be 45×30 inches.
    If printed at 300 dpi, then 15 x 10 inches.
    If the printout is even scaled to 12 x 8 inches, 375 dpi will be output.

    Driver – Incorrect screen resolution with graphics card with Displayport connected -> HDMI Ubuntu 18.04.2 LTS (BadMatch (invalid parameter attributes))

    My screen resolution is 1920×1080 when I get 2520×1080 (lg25UM58).
    My card is connected to a display port (GPU) on this screen with HDMI (screen)
    Is this a problem with the plug? Do you have any ideas?

    Here is my configuration:

    sudo lshw -C display
    *-display                 
           description: VGA compatible controller
           produit: GM107GL (Quadro K620)
           fabriquant: NVIDIA Corporation
           identifiant matériel: 0
           information bus: pci@0000:01:00.0
           version: a2
           bits: 64 bits
           horloge: 33MHz
           fonctionnalités: pm msi pciexpress vga_controller bus_master cap_list rom
           configuration: driver=nvidia latency=0
           ressources: irq:133 mémoire:de000000-deffffff mémoire:c0000000-cfffffff mémoire:d0000000-d1ffffff portE/S:e000(taille=128) mémoire:c0000-dffff
    

    Kernel Info

    uname -a
    Linux thomas-PC 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
    

    Xrandr edition

    xrandr 
    Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
    DVI-I-0 disconnected (normal left inverted right x axis y axis)
    DVI-I-1 disconnected (normal left inverted right x axis y axis)
    DP-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 673mm x 284mm
       1920x1080     60.00*+  59.94    59.93    50.00    60.05    60.00    50.04  
       2048x1152     59.91  
       1920x1200     59.95  
       1680x1050     59.95    59.88  
       1600x1200     60.00  
       1600x900      60.00    59.95    59.82  
       1440x900      59.89  
       1440x810      59.97  
       1400x1050     74.76    70.00    59.98  
       1400x900      59.96    59.88  
       1368x768      59.88    59.85  
       1360x768      59.96    59.80  
       1280x1024     85.02    75.02    60.02  
       1280x960      85.00    60.00  
       1280x800      59.91    59.81    59.97  
       1280x720      60.00    59.94    59.86    59.74    50.00    60.00    59.99  
       1152x864     100.00    85.06    85.00    75.00    75.00    70.00    60.00  
       1024x768      85.00    86.96    75.03    70.07    60.00  
       1024x576      59.90    59.82    59.96    59.95  
       960x600       60.00    59.93  
       960x540       59.82    59.63    59.99    59.96  
       864x486       59.92    59.57  
       840x525       85.02    74.96    69.88    60.01    59.88  
       832x624       74.55  
       800x600       85.14    75.00    72.19    60.32    56.25  
       800x450       59.95    59.82  
       720x576       50.00  
       720x480       59.94  
       720x450       59.89  
       720x405       59.51    58.99  
       720x400       85.04  
       700x525       74.76    59.98  
       700x450       59.96    59.88  
       684x384       59.88    59.85  
       680x384       59.96    59.80  
       640x480       85.01    75.00    72.81    59.94    59.93  
       640x400       85.08    59.98    59.88  
       640x360       59.84    59.32    59.86    59.83  
       640x350       85.08  
       512x384       70.07    87.06    60.00  
       512x288       60.00    59.92  
       480x270       59.82    59.63  
       432x243       59.92    59.57  
       400x300       72.19  
       360x202       59.51    59.13  
       320x240       72.81    60.05  
       320x180       59.84    59.32  
       320x175       85.27 
    

    Nvidia driver is obtained with 430

    sudo add-apt-repository ppa:graphics-drivers/ppa
    sudo apt update
    sudo apt install nvidia-driver-430 nvidia-settings
    

    What can I do to force the resolution?
    I'm trying

    cvt 2560 1080 60
    

    output

    # 2560x1080 59.98 Hz (CVT) hsync: 67.17 kHz; pclk: 230.00 MHz
    Modeline "2560x1080_60.00"  230.00  2560 2720 2992 3424  1080 1083 1093 1120 -hsync +vsync
    

    Add a mode

    xrandr --newmode "2560x1080_60.00"  230.00  2560 2720 2992 3424  1080 1083 1093 1120 -hsync +vsync
    
    xrandr --addmode DP-0 2560x1080_60.00
    

    Wich give me this error:

    X Error of failed request:  BadMatch (invalid parameter attributes)
      Major opcode of failed request:  140 (RANDR)
      Minor opcode of failed request:  18 (RRAddOutputMode)
      Serial number of failed request:  35
      Current serial number in output stream:  36
    

    homologous algebra – calculation of the injective resolution of some constant sheaves

    I follow the notations on "Sheaves on manifolds" by Kashiwara-Schapira. To let $ mathbb {K} $ to be a ground field and $ X $ to be a smooth variety. To let $ D (X) $ be the derived category of sheaves $ mathbb {K} $-Vektorräume. In this category, I would like to calculate an injecting (or flabby) resolution of a constant sheaf $ mathbb {K} _U $ (or. $ mathbb {K} _Z $) from where $ U $(or. $ Z $) is an open (or closed) subset of $ X $ to calculate the image of the constant sheaf over the right-derived functor of global sections $ R Gamma (X; mathbb {K} _U) $ (or. $ R Gamma (X; mathbb {K} _Z) $).

    Regression – resolution of discrete linear convolution functions

    Imagine, we have patterns $ mathbf {X} in mathcal {R} ^ {n times p} $ and we aim to find "regression" coefficients $ beta in mathcal {R} ^ {q times 1} $ ($ q> p $), but the regression is defined as a convolution function as follows:

    For each $ mathbf {x} $, we have:

    $$
    mathbf {x} odot beta = begin {cases}
    mathbf {x} _1 beta_1 + mathbf {x} _2 beta_2 + dots + mathbf {x} _p beta_p \
    mathbf {x} _1 beta_2 + mathbf {x} _2 beta_3 + dots + mathbf {x} _p beta_ {p + 1} \
    vdots \
    mathbf {x} _1 beta_ {q-p + 1} + mathbf {x} _2 beta_ {q-p + 2} + dots + mathbf {x} _p beta_q
    end {cases}
    $$

    that's why, $ mathbf {x} odot beta $ leads to a vector.

    Given a record $ mathbf {X} $can we solve a $ beta $ so there is something for everyone $ mathbf {x} in mathbf {X} $. $ mathbf {x} odot beta = mathbf {0} $?

    Networking – Name resolution issues

    We have some very strange problems on three servers.

    These servers happen to be Citrix servers that host user sessions. That's why we are aware of the problem.

    The symptoms are that;
    – Slow logins
    – Slow programs
    – Slow surfing the Internet

    After investigation, we found that the problem seems to be with DNS. When we restart the affected server, it is fine for a few days and the problem of slowness occurs.
    We have tried to investigate this for a long time, but have limited it to this symptom.

    If we try to ping a server for hostnames, like Google for example, it'll last for 10-15 seconds before actually doing anything. By that I mean, it will get stuck;

    C:  windows  system32> ping google.com
    

    Before we go to the afterlife 10-15 seconds.

    Ping google.com [216.58.206.238] with 32 data bytes:
    Answer by 216.58.206.238: Bytes = 32 Time = 16ms TTL = 49
    

    This only happens on the affected server, if we do it on another server in the infrastructure, it does not happen. If the server is restarted, it will reappear after a few days. This does not just affect one server, but all three servers within the Citrix hosts.

    However, if we perform an NSLOOKUP, the name will be resolved immediately and the information will be displayed immediately. Again, there are no host files.

    It also works immediately if we ping Google via IP. If we ping a device internally for the host name, it will be delayed after the IP address immediately. If we ping localhost, it has a delay, ping 127 is instant.

    We do not want to restart because this is just a sticky plaster we do not want.

    These are all VMs in a VMware environment running VMXNET3. They are fully patched and updated, this was done as part of the diagnosis.
    We can also replicate this problem with slowness. However, RDP on the server does not indicate the slowness, but the ping-search problem.

    We were wondering if this was a potential user profile / potential user causing this problem. However, you can not prove or understand how it could be connections and it has not had the problem. I am not sure how this could be the cause.

    Suggestions are welcome at this point!

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