virtualbox.org

Hi
I receive this error when booting up a ubuntu on VirtualBox on windows 11.
VirtualBox Version 6.1.36 r152435 (Qt5.6.2)
No extensions installed.
all 64bit installs
Guest is desktop Ubuntu 18.04.6 LTS
I have attached the last log file.

How do I get the guest back up and running?

Regards
Parish

The log is not compete, probably having been taken before all the VM's windows were closed. So some diagnostic info is missing.

However, the log does note that the VM's disk file is attached, but all attempts to find a bootable OS failed. It appears that something really went wrong inside the VM's OS.

Try putting the ISO that you installed in the VM back in, boot the VM from that, then web-search how to run a repair install.

Or, restore the VM's files from your host backups.