upgrader crashes after few minutes

[Bryant]

Eror
"unresolvable problem occurred while calculating upgrade"

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.38
ProcVersionSignature: Ubuntu 5.15.0-46.49~20.04.1-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 13 12:56:59 2022
InstallationDate: Installed on 2022-03-07 (158 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2022-08-13 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2022-08-13T07:28:33.892184

[Nick Rosbrook (enr0n)]

The problem appears to be that you have the PPA https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test enabled. E.g., this line from VarLogDistupgradeAptlog.txt:

  lib32stdc++6:amd64 Depends on gcc-12-base:amd64 < 12.1.0-2 @ii mK > (= 12-20220319-1ubuntu1) can't be satisfied!

Please try disabling that PPA and use the `ppa-purge` tool to remove the versions installed from that PPA, so that your toolchain packages are from the official focal archive. After that, please try the upgrade again.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]