Ubuntu Not Booting? Try These 5 Tips
Ubuntu typically works out of the box. But when problems booting arise, Ubuntu probably takes a while or simply does not boot at all.
If Ubuntu is not starting, work through these five steps:
Check for bootable devices
Is the GRUB bootloader working?
Repair the bootloader menu
Replace faulty hardware
While these steps are designed for Ubuntu users, they can be applied to other Linux operating systems. Note, however, that if you’re using disk encryption, some of these fixes will not work.
If your Ubuntu system isn’t booting, it’s time to work through these five steps.