I am now running 22.04 LTS. After sudo apt update, I got these errors:
Hit:1 https://mirror.xeonbd.com/ubuntu-archive jammy InReleaseHit:2 https://mirror.xeonbd.com/ubuntu-archive jammy-updates InRelease Hit:3 https://mirror.xeonbd.com/ubuntu-archive jammy-backports InRelease Get:4 https://brave-browser-apt-release.s3.brave.com stable InRelease [7,546 B]Hit:5 https://mirror.xeonbd.com/ubuntu-archive jammy-security InRelease Ign:6 https://repo.vivaldi.com/stable/deb stable InRelease Hit:7 https://repo.vivaldi.com/stable/deb stable Release Hit:8 https://pkg.surfacelinux.com/debian release InRelease Err:4 https://brave-browser-apt-release.s3.brave.com stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6CHit:10 https://ppa.launchpadcontent.net/ubuntuhandbook1/gdm-settings/ubuntu jammy InReleaseIgn:11 https://ppa.launchpadcontent.net/webupd8team/y-ppa-manager/ubuntu jammy InReleaseErr:12 https://ppa.launchpadcontent.net/webupd8team/y-ppa-manager/ubuntu jammy Release 404 Not Found [IP: 185.125.190.80 443]Reading package lists... DoneW: GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6CE: The repository 'https://brave-browser-apt-release.s3.brave.com stable InRelease' is not signed.N: Updating from such a repository can't be done securely, and is therefore disabled by default.N: See apt-secure(8) manpage for repository creation and user configuration details.E: The repository 'https://ppa.launchpadcontent.net/webupd8team/y-ppa-manager/ubuntu jammy Release' does not have a Release file.N: Updating from such a repository can't be done securely, and is therefore disabled by default.N: See apt-secure(8) manpage for repository creation and user configuration details.I uninstalled brave browser by sudo apt remove brave-browser and sudo apt purge brave-browser. I also deleted the cache and config file of brave browser.