Ubuntu启动慢问题解决方法

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最近Ubuntu的启动简直是慢得要命，起码15分钟。上网找到方法，具体操作如下：

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systemd-analyze blame
# 用于导出下面的开机时间结果

5min 3.650s plymouth-quit-wait.service #问题启动服务1
  5min 51ms vboxadd.service            #问题启动服务2
    50.933s apt-daily-upgrade.service  #问题启动服务3
     3.072s mysqld.service
     1.674s snapd.service
      766ms dev-loop16.device
      744ms snapd.seeded.service
      722ms dev-sda3.device
      669ms NetworkManager-wait-online.service
      668ms dev-loop4.device
      667ms dev-loop6.device
      666ms dev-loop7.device
      603ms logrotate.service
      603ms dev-loop5.device
      602ms dev-loop1.device
      585ms dev-loop2.device
      582ms dev-loop3.device
      581ms udisks2.service
      566ms dev-loop0.device
      555ms e2scrub_reap.service
      544ms networkd-dispatcher.service
      535ms systemd-logind.service
      465ms ufw.service
      455ms fwupd.service
      434ms accounts-daemon.service
      420ms man-db.service
      354ms ModemManager.service
      335ms snapd.apparmor.service
lines 1-28

# 这个语句看到开机总时间
brian@brian-ubuntu:~$ systemd-analyze
Startup finished in 1.816s (kernel) + 4.427s (userspace) = 6.244s 
graphical.target reached after 4.400s in userspace
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# 用这个语句来关闭启动服务，效果杠杠的
brian@brian-ubuntu:~$ sudo systemctl mask plymouth-quit-wait.service
[sudo] brian 的密码： 
Created symlink /etc/systemd/system/plymouth-quit-wait.service → /dev/null.
brian@brian-ubuntu:~$ sudo systemctl mask vboxadd.service
Created symlink /etc/systemd/system/vboxadd.service → /dev/null.
brian@brian-ubuntu:~$ sudo systemctl mask apt-daily-upgrade.service
Created symlink /etc/systemd/system/apt-daily-upgrade.service → /dev/null.

plymouth-quit-wait.service和vboxadd.service在Deepin中启动只需要半秒不到，不知道为啥在Ubuntu和LinuxMint为啥要这么久

参考链接：ubuntu开机，关机慢解决方法