Comment 11 for bug 1764853

Requested logs.
The failed first authentication is on Apr 21 11:05:28, immediatly after the second attempt succeeds.

Before I logged in with the domain account I checked that networking of the machine worked:
wbinfo -P and wbinfo -p both showed online, wbinfo -u displayed every user.

The DC is a Ubuntu 16.04 samba active directory. In a similar setup where I have the same problem I use a "18.04" ubuntu samba dc, but lets stay with this machine since I can reproduce the problem very reliably and the machine reboots quickly.

/etc/nsswitch has the following setup:
passwd: compat winbind systemd
group: compat winbind systemd
shadow: compat
gshadow: files

hosts: files resolve dns mdns_minimal
networks: files

protocols: db files
services: db files
ethers: db files
rpc: db files

netgroup: nis