My HP laserjet 1018 stopped printing from Ubuntu 18.04

[gwyn thomas]

I originally installed 16.04 on my newly acquired Dell Studio 2 months ago. I then installed my HP Laserjet 1018 and it ran well. I upgraded to 18.04 and the printer continued to work well until this morning when it decided not to work. I have checked the cables which all work. I do have an HP 6300 connected and it works when the same cable is plugged into it. The 1018 printer is switched on. I did switch 1018 on and off and it resets. I even ran a test page on the printer but cannot print test page from laptop.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: cups 2.2.7-1ubuntu2.8
ProcVersionSignature: Ubuntu 4.15.0-101.102-generic 4.15.18
Uname: Linux 4.15.0-101-generic i686
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: i386
CurrentDesktop: ubuntu:GNOME
Date: Fri May 29 07:17:56 2020
InstallationDate: Installed on 2020-03-16 (73 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release i386 (20180228)
Lpstat:
 device for hplaserjet: hp:/usb/HP_LaserJet_1018?serial=KP1E25R
 device for Officejet-6300-series: hp:/usb/Officejet_6300_series?serial=CN87AFV0DG04M4
 device for Officejet-6300-series-Fax: hpfax:/usb/Officejet_6300_series?serial=CN87AFV0DG04M4
MachineType: Dell Inc. Studio 1555
Papersize: a4
PpdFiles:
 Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Officejet-6300-series-Fax.ppd', '/etc/cups/ppd/hplaserjet.ppd', '/etc/cups/ppd/Officejet-6300-series.ppd'] failed with exit code 2: grep: /etc/cups/ppd/Officejet-6300-series-Fax.ppd: Permission denied
 grep: /etc/cups/ppd/hplaserjet.ppd: Permission denied
 grep: /etc/cups/ppd/Officejet-6300-series.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-101-generic root=UUID=631b51e9-3538-4ead-a72b-e2f2a3e59676 ro quiet splash vt.handoff=1
SourcePackage: cups
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/03/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0C234M
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd07/03/2009:svnDellInc.:pnStudio1555:pvrA07:rvnDellInc.:rn0C234M:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: Studio 1555
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.