[Bug 2090834] [NEW] vboxpostinstall.sh returned non-zero exit status 1.

[Launchpad Bug Tracker]

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We have multiple private bug reports where people try to install Ubuntu
24.04 using virtualbox but vboxpostinstall.sh fails.

All these bugs have:

* CasperMD5CheckResult: fail

So they all ended up closed automatically. I created an exception so
that such reports would not automatically get closed if they also have:

* CasperMD5CheckMismatches: ./boot/grub/grub.cfg

After investigating, I found out that vboxpostinstall.sh indirectly
relies on usermod to add the `vboxuser` user to a group (vboxuser is the
default name for VirtualBox unattended installations but can be changed
by when creating the VM).

We know for a fact that Subiquity-based installers do not create users
until first boot so using usermod in a postinstall scripts doesn't work.

Note that one cannot reproduce this issue with an Ubuntu Host OS at the
moment. The virtualbox package in Ubuntu does not have the autoinstall
support ; so when selecting unattended installation, there is no
automation at all. Autoinstall support is new in VirtualBox 7.1.

Workaround: https://bugs.launchpad.net/subiquity/+bug/2090834/comments/7

** Affects: ubuntu-desktop-provision
     Importance: High
         Status: Triaged

** Affects: virtualbox
     Importance: Unknown
         Status: Unknown

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: Triaged

-- 
vboxpostinstall.sh returned non-zero exit status 1.
https://bugs.launchpad.net/bugs/2090834
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