After using “sudo apt update” multiple error occurred, tried to get solution in stack overflow and Ask Ubuntu but couldn’t found any. Really new in this community it will be appreciable.
Err:2 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 0686B78420038257
Err:8 http://download.opensuse.org/repositories/home:/manuelschneid3r/xUbuntu_23.10 InRelease
The following signatures were invalid: EXPKEYSIG 1488EB46E192A257 home:manuelschneid3r OBS Project home:[email protected]
Err:9 http://download.opensuse.org/repositories/home:/pzz/xUbuntu_20.04 InRelease
The following signatures were invalid: EXPKEYSIG 23E07629B9E3C9E4 home:pzz OBS Project home:[email protected]
Err:13 https://apt.packages.shiftkey.dev/ubuntu any InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 7FC979028B1997C1
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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 0686B78420038257
E: The repository ‘https://ppa.launchpadcontent.net/nilarimogard/webupd8/ubuntu mantic 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 tried multiple options from Ask Ubuntu and stack overflow
- sudo apt-key adv –keyserver.ubuntu.com –recv-keys 0686B784200382
- /tmp/apt-key-gpghome.b8cdJNAbsB/gpg.1.sh –keyserver.ubuntu.com –recv-keys 0686B784200382
- /tmp/apt-key-gpghome.b8cdJNAbsB/gpg.1.sh –keyserver.ubuntu.com:80 –recv-keys 0686B784200382