OS: KDE Neon 5.14 based on Ubuntu 18.04 Kernel version: 4.15.0-42-generic

I tried booting from an older kernel version from the grub menu, still the system won't boot. It shows a long list of messages and doesn't proceed after the message

Started TLP system startup/shutdown.

Kernel was updated a few days ago. However, there was no problem booting after the update. I cannot identify what is causing this issue. Does it have something to do with the graphics driver?

Update: Running startx from the command line solved the issue. However, I would like to know what caused this issue.

Update 2: After reboot, the GRUB file is not found and system doesn't boot. I tried running the boot-repait utility and it fixed the grub. However the system boots into a black screen with a white blinking cursor, and does not show the login screen even after waiting for an hour.

  • How did you get to a prompt where you could run startx if the boot process gets stuck? Please can you clarify -- in your question. – roaima Dec 11 '18 at 22:24
  • I opened the prompt with Ctrl+Alt+F3 – kJd47 Dec 13 '18 at 6:29
  • So it did boot - at least to a login prompt? – roaima Dec 13 '18 at 7:20
  • It is presently showing just a blank screen with a blinking cursor. However, I am able to access the login prompt at this stage. – kJd47 Dec 13 '18 at 9:54

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