Epson Stylus SX535WD does not print in Ubuntu 20.04

[Steve Pemberton]

I have an Epson Stylus SX535WD, connected to the computer via USB. It prints correctly in Ubuntu 18.04. I recently upgraded to Ubuntu 20.04.2 LTS, and it no longer prints. The setup wizard seems to work. It detects the printer correctly, and asks for permission to install drivers from Epson. When I try to print, a message appears on the screen saying that the job has been submitted. A few seconds later, another message appears, saying the job has completed, but no output appears. The job shows up as completed in the printer queue. I tried printing a test page (Settings -> Printers -> Additional Printer Settings -> right-click the printer -> Properties -> Print Test Page), and also printing a document from LibreOffice.

I upgraded my hardware (motherboard and CPU) at the same time as Ubuntu, and thought that might be the cause of the problem, but I booted the computer from a live USB of Ubuntu 18.04, and the printer worked then.

I followed the recommendations at https://wiki.ubuntu.com/DebuggingPrintingProblems, none of which fixed the problem. Everything that the page tells me to check looks OK.

The printer has a built-in scanner, which works in 20.04.

Output from apt-cache (I'm not sure which of these are right or relevant):

steve@weddell:~$ apt-cache policy cups
cups:
  Installed: 2.3.1-9ubuntu1.1
  Candidate: 2.3.1-9ubuntu1.1
  Version table:
 *** 2.3.1-9ubuntu1.1 500
        500 http://gb.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.3.1-9ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages

steve@weddell:~$ apt-cache policy openprinting-ppds
openprinting-ppds:
  Installed: 20200401-1
  Candidate: 20200401-1
  Version table:
 *** 20200401-1 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        500 http://gb.archive.ubuntu.com/ubuntu focal/main i386 Packages
        100 /var/lib/dpkg/status

steve@weddell:~$ apt-cache policy ghostscript
ghostscript:
  Installed: 9.50~dfsg-5ubuntu4.2
  Candidate: 9.50~dfsg-5ubuntu4.2
  Version table:
 *** 9.50~dfsg-5ubuntu4.2 500
        500 http://gb.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     9.50~dfsg-5ubuntu4 500
        500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages

Attached is the output from the troubleshooter (Settings -> Printers -> Additional Printer Settings -> Help -> Troubleshoot).