やーん
Err:6 https://cli-assets.heroku.com/apt ./ InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5DC22404A6F9F1CA
Err:10 https://dl.yarnpkg.com/debian stable InRelease
The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <yarn@dan.cx>
$ sudo rm /etc/apt/sources.list.d/heroku.list
$ sudo rm /etc/apt/sources.list.d/yarn.list
こんな雑な感じでいいんだっけ。ついでにパッケージも消しておこう