message "printing completed", but no output

[Marina Reusens]

I got the problem after upgrading to Ubuntu 20.04 from 18.04. I re-installed cups. Printer is recognised over usb and also in the wireless network.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: cups 2.3.1-9ubuntu1.1
ProcVersionSignature: Ubuntu 5.4.0-62.70-generic 5.4.78
Uname: Linux 5.4.0-62-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CupsErrorLog:

CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 25 12:12:59 2021
InstallationDate: Installed on 2020-02-09 (350 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
Lpstat: device for Epson-Stylus-SX525WD: usb://EPSON/Stylus%20SX525WD?serial=4D4751593039363460&interface=1
Papersize: a4
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Epson-Stylus-SX525WD.ppd'] failed with exit code 2: grep: /etc/cups/ppd/Epson-Stylus-SX525WD.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-62-generic root=UUID=3bc80008-375c-4af5-8398-5172189bc318 ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: Upgraded to focal on 2020-09-30 (116 days ago)
dmi.bios.date: 01/18/2017
dmi.bios.vendor: Intel Corporation
dmi.bios.version: RYBDWi35.86A.0362.2017.0118.0940
dmi.board.name: NUC5i3RYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H41000-505
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0362.2017.0118.0940:bd01/18/2017:svn:pn:pvr:rvnIntelCorporation:rnNUC5i3RYB:rvrH41000-505:cvn:ct3:cvr: