@CyBerT
When you say you installed app with installer, you mean installing from https://open-store.io/ ?
I still get package installer keeps stopping
Best (meaning easiest) would be to save your personnal data and full reinstall with whipping user data then...
And after that, don't mess again with system folders or files that are designed to be read only for user, use the openstore, waydroid, libertine, crackle, snap, any ways that are supported by UBPorts to install apps on your system.
Don't use chmod, apt, or download files in system folders, unless you endorse the risk (and can easily recover) putting your phone in an unusable state.