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我真的需要apt-daily.service和apt-daily-upgrade.service吗?
以18.04的启动似乎需要更长的时间比17.10,所以我跑systemd-analyze blame,发现apt-daily.service和apt-daily-upgrade.service在他们之间的3分钟内占用。 :~$ systemd-analyze time Startup finished in 9.173s (kernel) + 3min 30.201s (userspace) = 3min 39.375s graphical.target reached after 15.268s in userspace :~$ systemd-analyze blame 1min 52.265s apt-daily-upgrade.service 1min 27.579s apt-daily.service 6.603s NetworkManager-wait-online.service 5.105s plymouth-quit-wait.service 1.517s plymouth-start.service 1.439s dev-sda1.device............. 那么,这些服务实际上在做什么(我猜想检查apt是否是最新的),为什么它们要花这么长时间,并且我真的需要它们在每次启动时都运行吗?