16.04 LTS does not boot, graphic resolution on screen low



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Grub 2 (GNU GRand Unified Bootloader 2. Generation) is the tool that rules the Boot order in the Linux Machines

We try to give here some tips on the different problems you may have with it. You can find an overview under https://help.ubuntu.com/community/Grub2 and its configuration possibilities under https://help.ubuntu.com/community/Grub2/Setup#Configuring_GRUB_2

We will describe here some of the possible problems you might experience when you boot (L)Ubuntu 16.04 LTS for the first time. Some laptops do not boot up properly, but instead "hang", or they can have a wrong, too low, graphic resolution, or they may go straight off at startup, or hang with a black screen. These problems can often be resolved by setting in the Grub configuration file.

If a laptop gives you too much trouble, contact a Labdoo Hub and its helpers.

Start computer using the "Recovery Mode" as follows:

  • Keep the Shift-button pressed when turning laptop on, press again after the BIOS messages shown, until the Grub menu is shown (GRUB controls the start process). You will also see the GRUB menu if power (I/O) is turned off during a start process.
  • Select "advanced options" and a Linux-Kernel and "Recovery-Start", just accept the next entries (press Enter) and log-in as labdoo user.
  • Alternatively, press the "e" key when the Grub Select menu appears. This change only applies to this boot process and does not replace the Grub2 configuration file for next boot processes (so that the configuration file needs to be modifed).

Changes in the grub2 configuration file

  • After booting and logging in, open an editor like nano , eafpad or vi. In this document, the further steps are based on the use of the nano-editor.
  • Open a terminal and type sudo nano /etc/default/grub (Enter). This will open the GRUB configuration file. If you are not familiar with the nano editor can use leafpad instead sudo leafpad /etc/default/grub (Enter)
  • After you have done the desired changes in the configuration file, save it and end editor (using nano editor by typing STRG/CTL and the letter o, then press Enter, next type STRG/CTL and x)
  • Then open a terminal and type sudo update-grub (Enter). This will finally store the changes made within the GRUB configuration.
  • Reboot computer. Hopefully the new configuration allows you to get the login screen correctly displayed


Computer does not boot or graphical resolution is wrong

If the graphical resolution is wrong (usually too low), try:

  • Edit the grub config file as described above
  • Search the line # GRUB_GFXMODE=640x480 and remove "#" at the beginning of the line (this "#" symbol disables the configuration described in that line, by removing the '#' you are now configuring a determined resolution). Change the pre-set resolution of "640x480" in the setting you need for the graphic resolution. Important: you may only use a resolution supported by your video card! You can get the possible resolution(s) as follows using the (L)Ubuntu desktop or Parted Magic:

    • (L)Ubuntu Desktop: Menu, select Preferences → Outputs → default → Resolution : will show available settings for resolution
    • Parted Magic:
      • Menu → Desktop Settings → Screen Layout Editor → Outputs : will show available settings for resolution
      • OR
      • System Profiler → Display → Resolution
  • Store the modification and end editor.
  • Then open a terminal and type sudo update-grub (Enter). This will finally store the changes made within the GRUB configuration.

Having made these changes you have a good chance to start your laptops using (L)Ubuntu 16.04 LTS, showing a good resolution on screen.

Computer goes to sleep when booting

The option acpi=off can help if the computer switches to sleep mode during the boot process.
More information can be found under https://askubuntu.com/questions/133467/ubuntu-12-04-boot-hangs-with-a-bl... (link is external)

Computer hangs at startup

Try he option pci=nomsi, more information under https://help.ubuntu.com/community/BootOptions

Computer takes a long time to boot up and even after the login to the display of the desktop

Try to configure video=insert SVIDEO-1:d; If this works, in the grub confguration file, the line should look likeGRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=SVIDEO-1:d", more information under https://askubuntu.com/questions/893817/boot-very-slow-because-of-drm-kms

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