升级到 20.04 后，我收到以下 W 警告：
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up-to-date.
W: http://gb.archive.ubuntu.com/ubuntu/dists/bionic/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://gb.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://gb.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
当我列出这些 bionic/InRelease 存储库的密钥时，它们没有列在密钥中，因此，如果我不知道要删除的密钥数字，我就无法删除它们。
我遇到了同样的错误，导致无法使用 synaptic 来管理包。
我将非常感激关于如何解决这个问题的建议。
理想情况下在终端中输入什么。
谢谢