[Bug 1960197] Re: package update-manager 1:20.04.10.10 failed to install/upgrade: update-manager.prerm: 6: py3clean: not found

[Benjamin Drung]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. Looking at your DpkgHistoryLog.txt, you are trying to
remove python3.8 which is the default Python in Ubuntu 20.04. A lot of
packages depend on Python and removing python3.8 will probably break a
desktop installation.

I tried to reproduce this failure in a minimal chroot, which worked fine:
```
apt-get install -y update-manager
apt-get remove python3.8
```

/var/lib/dpkg/info/update-manager.prerm in Ubuntu 20.04 (focal) guards
the call to py3clean:

```
if which py3clean >/dev/null 2>&1; then
	py3clean -p update-manager 
else
```

So py3clean shouldn't be called when py3clean is not installed. I fail
to figure out how you managed to run into this.

What were you trying to install/uninstall and why?

** Changed in: update-manager (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1960197

Title:
  package update-manager 1:20.04.10.10 failed to install/upgrade:
  update-manager.prerm: 6: py3clean: not found

Status in update-manager package in Ubuntu:
  Incomplete

Bug description:
  nothing to add

  TerminalLog.txt says:

  Suppression de update-manager (1:20.04.10.10) ...
  /var/lib/dpkg/info/update-manager.prerm: 6: py3clean: not found

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10.10
  ProcVersionSignature: Ubuntu 5.4.0-97.110-generic 5.4.162
  Uname: Linux 5.4.0-97-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.11-0ubuntu27.21
  Aptdaemon:

  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sat Feb  5 14:49:21 2022
  ErrorMessage: installed update-manager package pre-removal script subprocess returned error exit status 127
  GsettingsChanges:

  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.6
  SourcePackage: update-manager
  Title: package update-manager 1:20.04.10.10 failed to install/upgrade: installed update-manager package pre-removal script subprocess returned error exit status 127
  UpgradeStatus: No upgrade log present (probably fresh install)

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