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You can repair or reinstall GRUB to remedy and bootloader related issues.These would be any issues where the computer starts up fine, but as soon as it tries to start Ubuntu itself, it hangs or crashes. It's about as bad and frustrating as any technical problem gets, and more often than not, it feels like the system is totally shot.Fear not, though, Ubuntu has a couple of convenient ways to help repair your computer and get things back to normal. There's a utility that you can run from an Ubuntu live CD/USB that automatically repairs your system.After the upgrade, and when I reboot my PC, I noticed that the GRUB won’t appear any more.The reason is Grub 2 gets overridden when you install Windows or another Operating System. In order to make Ubuntu control the boot process back again, you just need Reinstall (Repair/Restore) Grub using a Ubuntu Live CD.It automatically searches for upgrades, and tries to detect any possible ways to clean up your system.
Finally, when all else fails, you can drop into a root terminal and try to fix things yourself.Included with every Ubuntu install is a series of fail-safe options that allow you to more easily recover a non-booting system.They let you take the reigns a bit more than the Boot-Repair utility, but they also allow you more options to mess up your system. From there, you'll see several different kernel options.Like any other time you log in as root, be careful. After you thin you have your system sorted out, you can try to boot normally with .With any luck, these tips helped you save your Ubuntu PC.
It might seem counter-intuitive, but you can enable a PPA and install software on a live CD. The first one is an automatic repair that will go through your system and attempt to repair it.