Apt

$ sudo apt update Err:9 https://pkg.jenkins.io/debian-stable binary/ Release.gpg The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5BA31D57EF5975CA W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://pkg.jenkins.io/debian-stable binary/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5BA31D57EF5975CA W: Failed to fetch https://pkg.jenkins.io/debian-stable/binary/Release.gpg The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5BA31D57EF5975CA W: Some index files failed to download. They have been ignored, or old ones used instead. ...

$ sudo apt update Err:2 https://apt.releases.hashicorp.com focal InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AA16FCBCA621E701 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://apt.releases.hashicorp.com focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AA16FCBCA621E701 W: Failed to fetch https://apt.releases.hashicorp.com/dists/focal/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AA16FCBCA621E701 W: Some index files failed to download. They have been ignored, or old ones used instead. https://developer.hashicorp.com/terraform/cli/install/apt wget -O- https://apt.releases.hashicorp.com/gpg | gpg --dearmor | sudo tee /usr/share/keyrings/hashicorp-archive-keyring.gpg gpg --no-default-keyring --keyring /usr/share/keyrings/hashicorp-archive-keyring.gpg --fingerprint echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list

https://unix.stackexchange.com/questions/470709/how-do-i-stop-disable-unattended-upgrades-from-being-launched-automatically 勝手にnvidia driverの更新が走って、 カーネルに読み込まれているdriverバージョンと、 ディスク上にあるdriverバージョンが一致しなくなって、 デスクトップアプリが起動しなくなったりする。 どうせ結構な頻度でapt upgradeするし、 再起動が保証されないタイミングで更新されて、 不安定になるのはいただけない。 sudo dpkg-reconfigure -plow unattended-upgrades これでTUIが起動するので、<No>を選ぶ。