Nimbostratus
NimbostratusI've just stumbled upon this issue after a user reported Ubuntu 18.04 (officially released today) wasn't working.
https://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/related/relnote-supplement-bigip-13-0-1.htmlA710407-1 identifies that QT 5.10.1 has issues and the "workaround" is to "Install Qt version 5.9.0 or lower, and make it the default installation."
I've not looked on an Ubuntu installation itself but Google suggests Ubuntu 18.04 runs QT 5.9.1 (maybe 5.9.5) so it's a case of nearly but not quite :(
NimbostratusUbuntu 18.04 uses QT 5.9.5, however after running into this problem, I downgraded to QT 5.9.1 using the Ubuntu 17.10 repos and the problem is resolved. Not the best solution, but there is indeed something going on with QT.