Some snap apps (namely discord and telegram-desktop), stopped opening when I turned my laptop on this morning (Fedora 31 64bit), and when opened from terminal discord shows this:
~/ discord
WARNING: cgroup v2 is not fully supported yet, proceeding with partial confinement
/snap/discord/109/usr/share/discord/Discord: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directory
and telegram-desktop shows this:
~/ telegram-desktop
WARNING: cgroup v2 is not fully supported yet, proceeding with partial confinement
/snap/telegram-desktop/1561/bin/telegram-desktop: error while loading shared libraries: libQt5Widgets.so.5: cannot open shared object file: No such file or directory
both packages are installed, and I'm a bit stumped after searching threads and forums for most of the morning, nothing I tried worked, reinstalling them, trying different versions of the libraries and then the apps, installing 32bit versions, and on and on. Any help, prompts, ideas, or just general rambling about what the issue could be is much appreciated.
TLDR: Snap apps giving "error while loading shared libraries" and "cannot open shared object file: No such file or directory" when opened. Packages that are missing are installed correctly, so I'm stumped.
The warning is not your issue.
The real problem is simply you miss some dependencies in your snaps: for some reason snap is not installing all the requiered depdencies, while it should. In an Ubuntu I have telegram-desktop and it works fine and I did this check:
snap list
to list the actual snaps.
And next I did check all the interdependencies by looking at the connections with:
snap connections telegram-desktop
this on my Utbuntu machine yields:
Interface Plug Slot Notes
alsa telegram-desktop:alsa - -
audio-playback telegram-desktop:audio-playback :audio-playback -
audio-record telegram-desktop:audio-record - -
content[gtk-3-themes] telegram-desktop:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] telegram-desktop:icon-themes gtk-common-themes:icon-themes -
content[kde-frameworks-5-core18-all] telegram-desktop:kde-frameworks-5-plug kde-frameworks-5-core18:kde-frameworks-5-core18-slot -
content[sound-themes] telegram-desktop:sound-themes gtk-common-themes:sound-themes -
desktop telegram-desktop:desktop :desktop -
desktop-legacy telegram-desktop:desktop-legacy :desktop-legacy -
gsettings telegram-desktop:gsettings :gsettings -
home telegram-desktop:home :home -
network telegram-desktop:network :network -
network-manager telegram-desktop:network-manager - -
opengl telegram-desktop:opengl :opengl -
pulseaudio telegram-desktop:pulseaudio :pulseaudio -
removable-media telegram-desktop:removable-media - -
unity7 telegram-desktop:unity7 :unity7 -
wayland telegram-desktop:wayland :wayland -
x11 telegram-desktop:x11 :x11 -
next I have found that the library libQt5Widgets.so.5 you are missing is provided by kde-frameworks-5-core18
sudo find /snap -name libQt5Widgets.so
/snap/kde-frameworks-5-core18/32/usr/lib/x86_64-linux-gnu/libQt5Widgets.so
I don't know if on fedora you could use:
snap install kde-frameworks-5-core18
to fix your missing dependency.
On the other side on Fedora and similar distros you could try to use flatpak instaead of snap: flatpak comes as default app-package manager for the Fedora family.
First you need to add flathub as a flatpak remote repository:
sudo flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
next you can search:
flatpak search discord
flatpak search telegram
and next install the apps:
sudo flatpak install com.discordapp.Discord
sudo flatpak install org.telegram.desktop
I tested this on a CentOS virtual machine (I dont' have a fedora ready to test, but CentOS is close enough) and I got them both correctly working.