Few quick checks: - have you rebooted after installing flatpak? If you didn't, please do so - Yes I rebooted - have you installed Angelfish using --user? - Yes - what does `flatpak list` return in terminal? - Try to enter Flatpak environment by running: flatpak run --command=sh org.kde.mobile.angelfish The last command should give you a prompt inside Flatpak. If something is wrong, it will fail.
[nemo@Sailfish ~]$ flatpak run --command=sh org.kde.mobile.angelfishbwrap: Creating new namespace failed: Invalidargumenterror: ldconfig failed, exit status 256 [nemo@Sailfish ~]$ devel-su [root@Sailfish nemo]# ldconfig [root@Sailfish nemo]# exit [nemo@Sailfish ~]$ flatpak run --command=sh org.kde.mobile.angelfishbwrap: Creating new namespace failed: Invalidargumenterror: ldconfig failed, exit status 256 [nemo@Sailfish ~]$ devel-su [root@Sailfish nemo]# flatpak-runner org.kde.mobile.angelfisherror: XDG_RUNTIME_DIR not set in the environment.[C] unknown:0 - Failed to create display (No such file or directory)[root@Sailfish nemo]#
[nemo@Sailfish ~]$ flatpak list Name Application ID Version Branch Origin Installation html5-codecs …esktop.Platform.html5-codecs 18.08 flathub user KDE Application… org.kde.Platform 5.12 flathub user Angelfish Webbr… org.kde.mobile.angelfish master kdeapps user