thank you:
here is the output of the mentioned command grep -H ppa /etc/apt/sources.list.d/* /etc/apt/sources.list
osman@DESKTOP-A849Q2J:~$ grep -H ppa /etc/apt/sources.list.d/* /etc/apt/sources.list
/etc/apt/sources.list.d/c2d4u_team-ubuntu-c2d4u4_0_-focal.list:deb [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/c2d4u_team-ubuntu-c2d4u4_0_-focal.list:# deb-src [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/c2d4u_team-ubuntu-c2d4u4_0_-focal.list.save:deb [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/c2d4u_team-ubuntu-c2d4u4_0_-focal.list.save:# deb-src [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/marutter-ubuntu-rrutter4_0-focal.list:deb [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/marutter-ubuntu-rrutter4_0-focal.list:# deb-src [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/marutter-ubuntu-rrutter4_0-focal.list.save:deb [
ppa.launchpad.net] focal main
/etc/apt/sources.list.d/marutter-ubuntu-rrutter4_0-focal.list.save:# deb-src [
ppa.launchpad.net] focal main
