Wednesday, July 10, 2019

grub2 - Ubuntu 12.04 Install - Black Screen - No Grub - Have run Boot Repair Disk

Day 4 of my purgatory.



History:




  • Had problems with live CD at first, had to set the "nomodeset" option ... and then it worked fine.


  • Installed Ubuntu "Alongside" Windows XP from live CD (NOT wubi)



  • Upon reboot after installation, I get the BIOS ... and then a black screen.


  • If I hit shift after the BIOS screen I get text that says "loading GRUB ..", but then no GRUB ... just a black screen.




What I have tried to do:




  • Total re-installation ... 3 times now. Also tried with wubi, same black screen. Have gone back to the normal (non-wubi) install.


  • After installation, I tried re-booting the live cd ... and trying to change GRUB file using: sudo gedit /etc/default/grub ... to "nomodeset" and "timeout=10" ... but won't let me save my changes because I'm using the live cd "in memory" system and don't have permissions to the disks (I think). I tried logging in ... but it won't let me.


  • I then read many posts on this site. I'm stuck.



  • This morning, I ran the "boot repair disk". Results here: http://paste.ubuntu.com/1132333/




What I think is wrong:




  • Since I can get the live CD to run (perfectly) with the "nomodeset" option, I think all I need to do is get to GRUB to change that ... but I can't get to GRUB.



Appreciate any advice.




Pat






Day 5 ...



I downloaded "Super Grub 2 Disk" from: http://www.supergrubdisk.org/super-grub2-disk/



This looks promising.




I can boot the disk and it brings me to a GRUB program that allows me to:



1) Boot to Windows ... which works
2) Boot to Ubuntu ... which does NOT work



When I choose boot to Ubuntu, I get lines across the screen which is an obvious video card problem. Likely because I need to set the "nomodeset" option.



So, I attempted to use super grub2 to edit the grub file ... but it is TOTALLY different than the Ubuntu grub file ... and I don't know where to put the "nomodeset" option.




Still stuck ...






The bottom line is that:



1) I need to edit /etc/default/grub on sda(1) ... which is my boot drive ... to add the "nomodeset" option



2) To do that I need to get into grub ... but, I can't. Holding down shift just echo's "loading grub .." and then takes me to a black screen




3) I can boot to the live CD by setting nomodeset .... but I cannot access the hard disk as root ... I can't save my changes!



Can anyone tell me how to login as root for the filesystem from the live CD ... so I can edit the grub file on the HARD DISK ... and then run update-grub??

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