For what it's worth, I had moved to 18.04 from 16.04 and regret it.
Booting takes longer, and I have an NVidia 1070 but NVidia XServer Settings has stopped working and if I try to run it it hangs the systems where the only option is to hard boot.
The issue is the new linux kernel used by 18.04. Nvidia drivers break.
In fact if you install debian, that waits before upgrading the last kernel, you do not have any problems.
This is the same thing that happened to me. It got to be such a bear to boot up that I eventually moved to Solus, which is a lovely, snappy, refreshing distribution. Really enjoying it. Beware of 18!