I upgraded one of my more complex machines today, a Thinkpad T450S running 18.10 to 19.04. This machine has a LAMP server installed with other development apps. Anyway, half way through the update I received a notice that a kernel upgrade failed, and then later on the update failed completely and said that the system is in an undetermined state.
So, the system boots to 19.04 with a 126.96.36.199 kernel. Apache seems to work OK. However, Nemo was not installed. So installed it from the repository. Any suggestions – I can do a clean install if necessary.