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Just installed 22.04 on a new machine with a 5700g and I get a black screen once it boots. I was only able to install by launching the installer through safe mode.

Problem is, I can't get into safemode when booting the installation. I have to spam escape to get it in time to stop the launch, but then once I am at the menu hitting escape again takes me out to the GRUB CLI. From there I don't know how to boot into safemode and I can't find any info on booting into safemode from the CLI.

Is there a way to get back to the grub menu from there, or to boot into safemode from the CLI?

user3810965
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1 Answers1

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GRUB documentation states that

While in the menu, you can switch to the command-line mode, and vice-versa

but I was unable to find documentation for opening the menu from the CLI in the documentation.

Instead, I booted from the installation USB which I was able to get into safemode. From there I was able to mount my main hard-drive and edited /etc/default/grub changing GRUB_TIMEOUT=0 to GRUB_TIMEOUT=10 to give time enough time to hit the key once without spamming and enter the menu.

I also was able to add the nomodeset option to the variable GRUB_CMDLINE_LINUX_DEFAULT in the same file, which let the graphics work properly when booting without recovery mode.

Then I followed these instructions to properly mount the relevant parts of my main disk and update-grub.

Then I was able to hit escape once without spamming because of the extra time, and enter recovery mode. I was also able to just boot regularly without a black screen because of the nomodeset option.

user3810965
  • 131