将 Ubuntu 服务器从 18.04 升级到 20.04 , 在执行 do-release-upgrade
时提示无法检查新版本, 完整的错误信息如下:
Checking for a new Ubuntu release Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings There is no development version of an LTS available. To upgrade to the latest non-LTS develoment release set Prompt=normal in /etc/update-manager/release-upgrades.
于是先用 ping 命令测试网络连接性:
ping -c 4 changelogs.ubuntu.com PING changelogs.ubuntu.com (91.189.88.185) 56(84) bytes of data.64 bytes from 91.189.88.185 (91.189.88.185): icmp_seq=1 ttl=46 time=235 ms64 bytes from 91.189.88.185 (91.189.88.185): icmp_seq=2 ttl=46 time=237 ms64 bytes from 91.189.88.185 (91.189.88.185): icmp_seq=3 ttl=46 time=235 ms64 bytes from 91.189.88.185 (91.189.88.185): icmp_seq=4 ttl=46 time=235 ms--- changelogs.ubuntu.com ping statistics ---4 packets transmitted, 4 received, 0% packet loss, time 3001ms rtt min/avg/max/mdev = 234.613/235.262/237.087/1.054 ms
可以 ping 通, 网络是没问题的。 用 curl 测试一下 https://changelogs.ubuntu.com/meta-release-lts , 看是不是 Ubuntu 的 changelogs 服务器问题
curl https://changelogs.ubuntu.com/meta-release-lts Dist: dapperName: Dapper DrakeVersion: 6.06 LTSDate: Thu, 01 Jun 2006 9:00:00 UTC Supported: 0Description: This is the Dapper Drake releaseRelease-File: http://old-releases.ubuntu.com/ubuntu/dists/dapper/ReleaseReleaseNotes: http://changelogs.ubuntu.com/EOLReleaseAnnouncement UpgradeTool: http://old-releases.ubuntu.com/ubuntu/dists/dapper/main/dist-upgrader-all/current/dapper.tar.gz UpgradeToolSignature: http://old-releases.ubuntu.com/ubuntu/dists/dapper/main/dist-upgrader-all/current/dapper.tar.gz.gpg
可以用 curl 获取到内容, changelogs 服务器看来也是没问题的。
因为是用 https 访问 changelogs 服务器, 突然想到会不会是因为 https 证书没有同步的导致的呢? 于是再尝试刷新一下服务器上的证书:
sudo update-ca-certificates --verbose --fresh export SSL_CERT_DIR=/etc/ssl/certs
刷新完 https 证书之后, 再次运行 do-release-upgrade
, 还是提示同样的错误。
经过一番搜索, 发现修改 MetaRelease.py
文件可以忽略证书的错误
sudo nano /usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py
修改内容如下:
from __future__ import absolute_import, print_function+ import ssl+ ssl._create_default_https_context = ssl._create_unverified_contextimport aptimport apt_pkg
保存修改过后的 MetaRelease.py
, 再次运行 do-release-upgrade
, 终于可以进行更新了。
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