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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.

closed as too broad by G-Man, Rui F Ribeiro, schily, RalfFriedl, GAD3R Dec 12 '18 at 7:23

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • 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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