Maybe this will help somebody, the only thing that works for me:
FoxitReader creates the file /home/nis/.local/share/applications
but gnome-software needs the directory /home/nis/.local/share/applications/
After deleting /home/nis/.local/share/applications all works well again.
(I installed FoxitReader as newcomer from Windows...
and now I tested all things proposed here.
With gnome-software --verbose let's me find the problem.)
Maybe this will help somebody, the only thing that works for me:
FoxitReader creates the file /home/nis/ .local/ share/applicati ons
but gnome-software needs the directory /home/nis/ .local/ share/applicati ons/
After deleting /home/nis/ .local/ share/applicati ons all works well again.
(I installed FoxitReader as newcomer from Windows...
and now I tested all things proposed here.
With gnome-software --verbose let's me find the problem.)