grub> _ appears instead of starting ubuntu after deletion of snapshots

Discussions about using Linux guests in VirtualBox.
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lesscaffee
Posts: 1
Joined: 4. Jan 2018, 17:35

grub> _ appears instead of starting ubuntu after deletion of snapshots

Post by lesscaffee »

Problem
Ubuntu operating system is not started. Instead of it the gnu grub bash-like terminal appears:

Code: Select all

GNU GRUB version 2.02~beta2-9ubuntu1.12
Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions.

grub> _
This is shown if I do grub> ls (hd0<TAB>:
no-known-filesystem-detected.png
no-known-filesystem-detected.png (11.23 KiB) Viewed 2841 times
Before the grub terminal appears I was able to catch some errors:
errors-before-grub-terminal-is-shown.png
errors-before-grub-terminal-is-shown.png (11.63 KiB) Viewed 2841 times
The VirtualBox menu for selection of boot devices can be triggered.
Steps applied which lead to problem (Before having applied these steps everything worked since months without problems!):
  1. Open Oracle VirtualBox Gui (v5.1.30).
  2. Select virtual machine.
  3. Go to tab "Snapshots".
  4. Delete step by step each existing snapshot.
  5. The deletion executed without failures (at least nothing poped up on the gui).
  6. Start virtual machine in the same Oracle VirtualBox GUI.
  7. Windows open and the grub terminal appears instead of loading the ubuntu operating system.
I already tried to create a new virtual machine and apply the same vdi hard disk to it but the same problem occurs. This tells me that something bad changed in the vdi file, or?

I'm able to assign an optical drive, e.g. a ubuntu live disc, and VirtualBox starts it normally without any problem.
existing-kernel.png
existing-kernel.png (11.93 KiB) Viewed 2841 times
Please help!

I posted this problem also on https://ubuntuforums.org/showthread.php?t=2381782
Last edited by socratis on 5. Jan 2018, 09:21, edited 1 time in total.
Reason: Fixed obfuscated URLs.
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