I have the same issue, in my case at least it's definitely the issue you found Sebastien.
As pointed out at https://answers.launchpad.net/ubuntu/+source/gnome- system-monitor/+question/693912, Ubuntu is not a rolling release, but it would improve UX, and as noted at https://wiki.ubuntu.com/StableReleaseUpdates updates with simple changes that don't affect infrastructure may be candidates. Of course, it's not my decision to make, and if there's no interest I will instead report to the Linux Mint people, but I figure trying upstream first is better. ** Changed in: gnome-system-monitor (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-system-monitor in Ubuntu. https://bugs.launchpad.net/bugs/1881197 Title: No network usage info presented, always 0 bytes/s. Status in gnome-system-monitor package in Ubuntu: Confirmed Bug description: 1) Description: Ubuntu 20.04 LTS Release: 20.04 2) gnome-system-monitor: Instalado: 3.36.0-1 Candidato: 3.36.0-1 Tabela de versão: *** 3.36.0-1 500 500 http://br.archive.ubuntu.com/ubuntu focal/main amd64 Packages 100 /var/lib/dpkg/status 3.28.1-1 500 500 http://cz.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 3) There should be a graph drawn with the info about my network usage, as well as number on the download/upload speeds. 4) Pretty much nothing happens. It calculates how much data I've downloaded/uploaded since the OS was booted, but that's it. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-system-monitor 3.36.0-1 ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34 Uname: Linux 5.4.0-33-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.2 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Thu May 28 17:51:55 2020 ExecutablePath: /usr/bin/gnome-system-monitor InstallationDate: Installed on 2019-12-06 (173 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) ProcEnviron: LANGUAGE=pt_BR:pt:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=pt_BR.UTF-8 SHELL=/bin/bash SourcePackage: gnome-system-monitor UpgradeStatus: Upgraded to focal on 2020-04-25 (33 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/1881197/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
