Public bug reported: Flatpak seems to have serious issues on kubuntu 20.04, at least with some applications that immediately hang when a file dialog is shown.
One of them that makes the issue well reproducible for me on kubuntu 20.04 is shotcut (https://www.flathub.org/apps/details/org.shotcut.Shotcut). Just install it and then press the "Projects Folder" button in the "New Project" to make the app hang. Trying the more recent flatpak on the ppa:alexlarsson/flatpak ppa, which is at 1.10.2 provides a slightly less catastrophic outcome, since the app doesn't hang. However the "open" button of the file dialog does not work and the dialog cannot be closed. The issue may have to do with the xdg-desktop-portal-kde rather than flatpak itself. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: flatpak (not installed) ProcVersionSignature: Ubuntu 5.8.0-45.51~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-45-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: KDE Date: Sun Mar 21 22:13:27 2021 EcryptfsInUse: Yes InstallationDate: Installed on 2020-02-16 (399 days ago) InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) SourcePackage: flatpak UpgradeStatus: Upgraded to focal on 2020-05-23 (302 days ago) ** Affects: flatpak (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1920690 Title: File chooser dialog cause flatpak applications to hang in KDE To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/flatpak/+bug/1920690/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs