OPI Win Plus + Ubuntu Desktop 16.04.3 LTS, does not have enabled serial OTG.
Trying to follow advice from this topic I got (in system log) as follows:
...................
dev-ttyGS0.device: Job dev-ttyGS0.device/start timed out.
Mar 29 13:19:32 localhost systemd[1]: Timed out waiting for device dev-ttyGS0.device.
Mar 29 13:19:32 localhost systemd[1]: Dependency failed for Serial Getty on ttyGS0.
Mar 29 13:19:32 localhost systemd[1]: serial-getty@ttyGS0.service: Job serial-getty@ttyGS0.service/start failed with result 'dependency$
Mar 29 13:19:32 localhost systemd[1]: dev-ttyGS0.device: Job dev-ttyGS0.device/start failed with result 'timeout'.
...................
Please help!
Otherwise all seem to work very well., for now.