Ubuntu – Black loading screen

bootnvidiascreenxubuntu

This is the first time that I use Xubuntu and I'm experiencing a problem with it. D:
I've just installed Xubuntu 12.10 desktop 64-bit on my laptop alongside with Windows 8.
When I choose Ubuntu from grub loader, the screen goes black and the LCD backlight goes off: the white-bar-on-blue-background Xubuntu loading screen doesn't appear, but after a few seconds the Xfce login window materializes and the desktop enviroment after login works fine. When I shutdown or restart the system, the white-bar-on-blue-background Xubuntu loading screen magically appears! 🙂
I know that is only an aesthetic bug, but how can I bring back the Xubuntu loading screen on boot?
Please notice that my video card is the Nvidia NVS 2100M, and that I'm NOT experiencing any problem with Xfce's desktop.
A huge kiss to anyone who will help me! :*

Best Answer

This doesn't seem to be specific to particular graphics cards. It just appears that the framebuffer code or the choice when to use it is less robust on some newer Ubuntu versions. I am encountering the same on some of my machines. What you can do is on the grub prompt use vbeinfo and see which graphic modes are supported. Then after booting do

sudo editor /etc/default/grub

and uncomment the line #GRUB_GFXMODE=640x480, i.e. remove the #. Then adjust the resolution to a value that was listed as supported by grub on the prompt.

After that run:

sudo update-grub

and test by rebooting.

If you want to get rid of the progress screen and prefer the classic console output, simply don't edit the line mentioned above and instead uncomment the line #GRUB_TERMINAL=console.

here's your problem:

=================== blkid:
/dev/sda3: UUID="f18a769e-4f52-49ad-a38e-bab773834ad8" TYPE="crypto_LUKS"


mount: unknown filesystem type 'crypto_LUKS'
mount /dev/sda3 : Error code 32
mount -r /dev/sda3 /mnt/boot-sav/sda3
mount: unknown filesystem type 'crypto_LUKS'
mount -r /dev/sda3 : Error code 32

ermm...

at this point, you'll probably need to load up a live cd, and mount your lukscrypt partition there, with the decryption key.

you're going to need to use /dev/mapper for mounting sda3 in your fstab/mount commands.

At this point, I suspect, you're going to need to boot to a live Ubuntu CD, chroot the Ubuntu environment, mount all the partitions on all the drives, and run grub-update. This process should both recover the boot for Windows and Linux to the grub menu.

Try the following:

Boot the Ubuntu LiveDVD
Select the option Try Ubuntu
Then try the following:
```
sudo su -
mount /dev/sda3 /mnt
cryptsetup luksOpen /dev/sda3/ crypthome
mount /dev/mapper/crypthome /mnt
```
At this point, you'll have mounted your encrypted LUKS partition to /mnt on the LiveDVD.

I would advise saving everything from /mnt/home to external storage before continuing. Worst case, if this becomes too painful, you can start over and at least save any docs/pics/desktop/junk/etc you may have been working on.
Now we're going to attempt to fix things... through a chroot
```
mount --bind /dev /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt /bin/bash
```
At this stage you'll be in your PC's native OS in a chroot environment, but we're far from clear of your problem: we're going to need to review things, so your input from here forward will greatly help.
copy things that will help us diagnose, your pc should have internet access as well, if not you can place the following things on external storage and paste individually to http://paste.ubuntu.com/ passing the links back to this help topic.
```
/etc/fstab
/dev/mapper/*
```
- Please update on your progress and pain points. At the moment, it's hard to decypher just what went wrong
- you're running full disk encryption and the mount point for dev/mapper doesn't appear to be properly set up, so boot is failing...

Best Answer

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here's your problem:

ermm...

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