Comment 2 for bug 1827757

Can confirm that this problem still exist on the latest LTS release.

I tested connecting to enterprise network with enabled and required PMF ( Protected Management Frames / Management Protected Frames or 802.11w ) on Ubuntu 18.04.3 LTS (with all updates) - all attempts failed, when the PMF was set to `Required` on the AP side.
I also tested with my home setup: TP-Link AP ( OpenWrt 18.06.5 ) and 802.11w set to `Required` in the `Wireless Security` section.

The current wpasupplicant version for 18.04 is 2:2.6-15ubuntu2.5
When the Network Manager tries to connect to the AP, it fails because the activation takes too long.
I tested the Ubuntu 19.10 Eoan release and it seems that the wpasupplicant is able to connect to APs with Required PMF option.

I found a workaround for Ubuntu 18.04 Bionic, but it is a bit "hacky/risky" - basically force upgraded the wpasupplicant and all deps with the packages from Ubuntu 19.10 Eoan. The dependency packages can be downloaded from https://packages.ubuntu.com

Package versions:

libnl-3-200_3.4.0-1_amd64.deb
libnl-route-3-200_3.4.0-1_amd64.deb
locales_2.30-0ubuntu2_all.deb
libc-bin_2.30-0ubuntu2_amd64.deb
libc6_2.30-0ubuntu2_amd64.deb
libc6_2.30-0ubuntu2_i386.deb
libtinfo6_6.1+20190803-1ubuntu1_amd64.deb
libreadline8_8.0-3_amd64.deb
wpasupplicant_2.9-1ubuntu2_amd64.deb

NOTE: force upgrade this packages only if you are sure that they will not break your existing apps.
If you are stuck with the LTS version, but you want the be able to connect to APs with mandatory PMF until this issue is resolved, you can try the workaround on your own risk (future LTS updates could break this setup).