I did an X.org update on Ubuntu, and that landed me with some graphics problem and ultimately into shell.
Is there something like SANDBOX on which you could try out something and rollback if not liked ?
Please help.. !
If you hold left-shift immediately after BIOS you should see a menu asking you what you want to boot to. This is the grub bootloader which usually just selects the latest kernel.
If you then select the latest "recovery mode", that should present you with another menu which should allow you to pick faisafeX which again, presents another menu which lets you use the most bog-standard drivers possible. This might let you temporarily get back into a graphical setting. There are also options for resetting configurations in this deepest menu which might also be worth a go.
If that doesn't hail any success, the update that broke things may have been a new kernel version. In grub try selecting the second non-recovery item. If that boots through, you might just need to select this manually each boot, and of course, file a bug report on Launchpad against the Linux project so people know there's an issue.
Either way, actually, what you're doing needs to end in a bug report or nothing is going to get fixed.
As for protecting yourself against these issues in the future the only viable methods for major system things (like graphics) is to keep some sort of backup from before you update. This either means:
btrfs (which is now fairly stable) that will let you take live snapshots of the system, and roll back to the old system.I freely admit that neither is a convenient solution. The first requires booting into a live-CD environment before you can take the image and the second requires reinstallation and reformatting the disk to btrfs (I don't think there is a nice conversion tool) besides having to learn the process for taking and restoring snapshots.
