linux を使ってるとしばしばsudo apt-get update をするのですが、よく警告が出てきます。今回はそのお掃除
また増えたらかきたすかも（2020/05/16）
今回は２つ
E: The repository 'http://ppa.launchpad.net/kazam-team/unstable-series/ubuntu bionic Release' does not have a Release file.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://nvidia.github.io/nvidia-docker/ubuntu18.04/amd64 InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6ED91CA3AC1160CD
上が見にくいために平文も貼っておきます↓
E: The repository 'http://ppa.launchpad.net/kazam-team/unstable-series/ubuntu bionic Release' does not have a Release file.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://nvidia.github.io/nvidia-docker/ubuntu18.04/amd64 InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6ED91CA3AC1160CD
解決策 1
公開鍵の期限が切れているので更新してあげる。
参照：https://linuxconfig.org/how-to-list-and-remove-ppa-repository-on-ubuntu-18-04-bionic-beaver-linux
解決策 2
ppaファイルのrepository を消してあげる。
sudo apt-add-repository -r ppa:kazam-team/unstable-series
参照：https://linuxconfig.org/how-to-list-and-remove-ppa-repository-on-ubuntu-18-04-bionic-beaver-linux