Some clarification. I'm using ubuntu 18.04 with an HP Laserjet 500 MFP 570dn... two servers, two of the same printer, and the same issue. It appears to have occured after the following unattended upgrade:
Upgrade: libgs9:amd64 (9.26~dfsg+0-0ubuntu0.18.04.8, 9.26~dfsg+0-0ubuntu0.18.04.9), ghostscript:amd64 (9.26~dfsg+0-0ubuntu0.18.04.8, 9.26~dfsg+0-0ubuntu0.18.04.9), ghostscript-x:amd64 (9.26~dfsg+0-0ubuntu0.18.04.8, 9.26~dfsg+0-0ubuntu0.18.04.9), libgs9-common:amd64 (9.26~dfsg+0-0ubuntu0.18.04.8, 9.26~dfsg+0-0ubuntu0.18.04.9)
Some clarification. I'm using ubuntu 18.04 with an HP Laserjet 500 MFP 570dn... two servers, two of the same printer, and the same issue. It appears to have occured after the following unattended upgrade:
Upgrade: libgs9:amd64 (9.26~dfsg+ 0-0ubuntu0. 18.04.8, 9.26~dfsg+ 0-0ubuntu0. 18.04.9) , ghostscript:amd64 (9.26~dfsg+ 0-0ubuntu0. 18.04.8, 9.26~dfsg+ 0-0ubuntu0. 18.04.9) , ghostscript-x:amd64 (9.26~dfsg+ 0-0ubuntu0. 18.04.8, 9.26~dfsg+ 0-0ubuntu0. 18.04.9) , libgs9-common:amd64 (9.26~dfsg+ 0-0ubuntu0. 18.04.8, 9.26~dfsg+ 0-0ubuntu0. 18.04.9)