Hi list
I upgraded my Lubuntu installation on a netbook from 16.04 LTS to 18.04 LTS. After the upgrade all network printers (Brother HL-2070N and HP DJ950C over print server) don't print any more. In the printer status says "Filter failed" and when I push button "selftest" on the printed page I read "if you read this the wrong driver is in use".

Any help?