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我遇到了 ca 证书的问题。我尝试访问的每个站点都要求我确认认证，而我的更新也无法 100% 运行

$ sudo rm -rf /etc/ssl/certs/*
$ sudo update-ca-certificates Updating certificates in /etc/ssl/certs... 152 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....done.
$ sudo apt-get update
[...]                                
Err private-ppa.launchpad.net precise/main amd64 Packages              
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt    CRLfile: none
Err private-ppa.launchpad.net precise/main i386 Packages
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Ign private-ppa.launchpad.net precise/main Translation-en_US
Ign private-ppa.launchpad.net precise/main Translation-en
Fetched 1,118 kB in 44s (24.9 kB/s)

E: Some index files failed to download. They …