After searching in various directories I found in ".local/share/applications/" a file named "mimeapps.list" with a suspicious line: inode/directory=userapp-synaptic-WIL2KU.desktop;nautilus-folder-handler.desktop;userapp-gedit-LD26KU.desktop;brasero-open-project.desktop;
After removing "userapp-synaptic-WIL2KU.desktop;" my system works normal now. Still I do'nt know, how this list was corrupted.
After searching in various directories I found in ".local/ share/applicati ons/" a file named "mimeapps.list" with a suspicious line: inode/directory =userapp- synaptic- WIL2KU. desktop; nautilus- folder- handler. desktop; userapp- gedit-LD26KU. desktop; brasero- open-project. desktop; synaptic- WIL2KU. desktop; " my system works normal now. Still I do'nt know, how this list was corrupted.
After removing "userapp-