[Bug 1924850] Re: package usrmerge 24ubuntu3 failed to install/upgrade: installed usrmerge package post-installation script subprocess returned error exit status 1

[Andrew]

I'm so confused. My 21.04 installation aborted over this, and I was
warned my system may be in an unuseable state, except when I login via
ssh it says it is 21.04 and apt doesn't seem to detect anything to
update...so...how do I know if there is any work unfinished, and how can
I check my system has updated properly, or if there are outstanding
upgrade tasks to be performed?

I was going to attached my var/log/installer - except I saw every file
is empty / zero bytes, so it's pointless!? Am using a CloudVPS via Onapp
via Neostrada.

After the errors, I moved sbin/grub-install to opt/mytemp/grub-install and then ran 
/usr/lib/usrmerge/convert-usrmerge 
which gave the same complaint again this time about update-grub 
so I moved sbin/update-grub to opt/mytemp/update-grub and then ran
/usr/lib/usrmerge/convert-usrmerge 
again - and this time it gave no further errors.
Instead saying:
The system has been successfully converted
So then I tried:
dpkg --configure -a
which said:
Setting up usrmerge (24ubuntu3) ...
and then went quiet, returning me to the prompt.
I tried it again:
dpkg --configure -a
and got nothing on screen, just a new command prompt line - I assume it ran successfully or something.

So was this just a bumpy upgrade and all is good,
or is something now wrong with my system, and I need to do something to finish the installation process?

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https://bugs.launchpad.net/bugs/1924850

Title:
  package usrmerge 24ubuntu3 failed to install/upgrade: installed
  usrmerge package post-installation script subprocess returned error
  exit status 1

Status in usrmerge package in Ubuntu:
  Confirmed

Bug description:
  I ran "sudo mv /bin/usb_printerid /tmp" to continue with the install

  ProblemType: Package
  DistroRelease: Ubuntu 21.04
  Package: usrmerge 24ubuntu3
  ProcVersionSignature: Ubuntu 5.11.0-14.15-generic 5.11.12
  Uname: Linux 5.11.0-14-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Sat Apr 17 14:32:26 2021
  ErrorMessage: installed usrmerge package post-installation script subprocess returned error exit status 1
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.9, Python 3.9.4, python3-minimal, 3.9.4-1
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.20.7.1ubuntu4
   apt  2.2.3
  SourcePackage: usrmerge
  Title: package usrmerge 24ubuntu3 failed to install/upgrade: installed usrmerge package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to hirsute on 2021-04-17 (0 days ago)

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