upgrade from 18.04 to 20.04 error

[Stefano Giorgi]

This label stop the upgrade:

Impossibile calcolare l'avanzamento

Si è verificato un problema irresolubile durante il calcolo dell'avanzamento.

 Nel caso fosse un altro problema, segnalare un bug eseguendo in un terminale il seguente comando: «ubuntu-bug ubuntu-release-upgrader-core». Per investigare il problema consultare i file di registro in «/var/log/dist-upgrade» che possono contenere maggiori dettagli riguardo all'avanzamento. In particolare, consultare i file «main.log» e «apt.log».

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
Uname: Linux 4.15.0-121-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 14 09:28:28 2020
InstallationDate: Installed on 2014-05-30 (2328 days ago)
InstallationMedia:

PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-14 (0 days ago)
VarLogDistupgradeTermlog:

[Stefano Giorgi (stefanone)]

Fixed after removing obsolete SW and snapd and gnuradio.

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1898152, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.