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My laptop has a nomodeset problem, check the link for more info. Basically, I would need to add nomodeset in grub in order to boot any linux distro.

If I want to use a distro, i'd need to install it, boot it, press e on boot menu, add nomodeset, and when it boots, i fix the grub menu forever and update it.

Today I'm looking to try a new debian distro, but i don't want to install it, my laptop is already dualbooted, i don't want to tripleboot it.

I don't like virtualbox or vmware, i'm not a fan of visualization, besides the distro that i'm trying doesn't play well on virtual machines.

All i want to do is to boot it from live cd, but the problem is that when you boot it from live cd, you aren't presented with a grub menu and you can't press e to edit it, so there's no way for me to add nomodeset, without that option, i'll never be able to see the screen.

How to edit grub when booting from a live cd?

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2 Answers

up vote 2 down vote accepted

I know you want to find a simple solution for your simple question, but I'm afraid that there is no easy solution for you, because almost all live cds are boot with isolinux, i.e., not grub, so there is no way you can edit grub when booting from the live cd.

You can re-create the live cd to boot with grub if you want. Ref: Booting CD with grub

Or your can learn how to use isolinux to put in that nomodeset. It's quite simple:

  1. press TAB at the live cd boot up screen
  2. appended nomodeset options at the kernel prompt
  3. press enter to boot the live cd with the nomodeset kernel option
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If the live CD doesn't give you an opportunity to, I don't think you can just edit it. However, if you know the grub line used to boot the live cd, you can:

  1. Put the disk in
  2. Load GRUB from the harddrive
  3. Drop to the GRUB command shell
  4. Set the root device as the CD-ROM
  5. Use the same kernel options as the live cd, plus the nomodeset option to boot the live system.
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