我正在尝试运行更新，我收到了很多“Hit”和“Ign”，但最后我收到了这些错误，有人知道它们是什么意思以及我该如何修复它们吗？
W: GPG error: http://speglar.simnet.is olivia Release: The following signatures were invalid: BADSIG 3EE67F3D0FF405B2 Clement Lefebvre (Linux Mint Package Repository v1) <root@linuxmint.com>
W: GPG error: http://speglar.simnet.is raring Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://archive.canonical.com raring Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://ppa.launchpad.net raring Release: The following signatures were invalid: BADSIG 5A9A06AEF9CB8DB0 Launchpad PPA for Ubuntu Wine Team