我的发行版从 ubuntu 18.04 升级到 20.04 时，在 unattended-upgrades 处停留了大约 20 分钟。这正常吗？您有什么建议吗？我现在应该怎么做？您有什么建议吗？
我试过：sudo dpkg --configure -a; sudo apt dist-upgrade -f
and it returned:
dpkg: error: dpkg frontend lock is locked by another process
Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 8680 (focal)... 21s
