Nothing suggested works for me. All latest updates installed and latest DisplayLink driver.
Ubuntu 16.04 LTS: I use triple monitor config side by side (left to right: internal+2xdock) and issues (with different configs) I encounter are:
- only one dock monitor is detected
- it takes really long to detect dock monitors
- dock replug sometimes creates extra /dev/fb*
- artefacts on left side of internal panel (invisible mouse cursor, window drag traces, invisible unity dock)
- artefacts on right side of right monitor (invisible mouse cursor, window drag traces)
- internal panel response is too slow
Now I'm back on Ubuntu 14.04 LTS with 1.1.62 drivers - it works without issues.