It's weird, it looks like the other users processes are displayed for a second after toggling the option. They are also listed after restarting gnome-system-monitor, so looks rather a bug in the UI side than a permission issue from the snap confinement
-- 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/1778361 Title: The Processes tab only displays the current user's processes Status in gnome-system-monitor package in Ubuntu: Confirmed Bug description: *** *** Please attribute this bug to the correct package. *** ubuntu-bug -w failed. The "All Processes" option only displays the current user's processes. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gedit 3.28.1-1ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sat Jun 23 17:02:00 2018 InstallationDate: Installed on 2018-05-03 (50 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gedit UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/1778361/+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