printer configuration with ubuntu 20.04 - Epson ET 2750 printer not found

I don't know if this is a bug, just have been having lots of problems with all my laptops after trying to get new version of ubuntu. Don't know if my version is corrupt.

Ubuntu 20.04.1 Lts Focal

When i Typed 'apt-cache policy pkgname', N : Unable to locate package pkgname

I was trying to send document to print (which was no problem) until 3 days ago

Nothing happened - it said printer error. I deleted the printer and tried to reinstall it - but still it wouldn't print.

Also all my libreoffice files have been converted to excel format in read only format. Why?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: cups 2.3.1-9ubuntu1.1
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 30 14:40:52 2020
InstallationDate: Installed on 2018-04-30 (945 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lpstat: device for CUPS-BRF-Printer: cups-brf:/
MachineType: Hewlett-Packard HP Folio 13 Notebook PC
Papersize: a4
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/CUPS-BRF-Printer.ppd'] failed with exit code 2: grep: /etc/cups/ppd/CUPS-BRF-Printer.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-54-generic root=UUID=0950c369-cf83-439d-aabf-379cc7bfdd0d ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: Upgraded to focal on 2020-09-15 (75 days ago)
dmi.bios.date: 03/05/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.06
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 17F8
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 46.34
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.06:bd03/05/2012:svnHewlett-Packard:pnHPFolio13NotebookPC:pvr068C100000204A00000320100:rvnHewlett-Packard:rn17F8:rvr46.34:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV
dmi.product.name: HP Folio 13 Notebook PC
dmi.product.sku: A3V88PA#UUF
dmi.product.version: 068C100000204A00000320100
dmi.sys.vendor: Hewlett-Packard