apt-get update hanging twice (work-around included)

[selrahal]

I experienced this hang and did some digging, found pretty much what you are saying. The time-sync target is not being reached, any timer depending on this cannot be started. My active jobs list shows this (since boot):

Code:

root@mobian:/home/mobian# systemctl list-jobs

JOB UNIT                           TYPE  STATE 
65  timers.target                  start waiting
70  apt-daily-upgrade.timer        start waiting
68  apt-daily.timer                start waiting
72  e2scrub_all.timer              start waiting
67  man-db.timer                   start waiting
69  fwupd-refresh.timer            start waiting
71  fstrim.timer                   start waiting
25  time-sync.target               start waiting
24  systemd-time-wait-sync.service start running

Curious enough, timedatectl shows everything is ok:

Code:

root@mobian:/home/mobian# timedatectl status
              Local time: Fri 2020-08-07 12:47:27 EDT 
          Universal time: Fri 2020-08-07 16:47:27 UTC 
                RTC time: Fri 2020-08-07 16:47:28     
                Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes                         
              NTP service: active                     
          RTC in local TZ: no

systemd-time-wait-sync start the command '/lib/systemd/systemd-time-wait-sync' and waits for it to exit. If i start that manually it, correctly, exits immediately. But for some reason the process started earlier isn't getting updated. By restart the systemd-time-wait-sync service everything works without a reboot: 'systemctl restart systemd-time-wait-sync'



I think this bug is the culprit: https://github.com/systemd/systemd/issues/15947



I am running Mobian which has switched to chrony, not sure if that is related.