Hello, i discovered some bugs and hope you can fix it! 
Tested on VU+ Ultimo with newest openpli 4.
Bug1:
Scam not working because of missing lib.
If installing scam it should also install automatically "libcrypto-compat".
Bug2:
Not really a bug, but maybe the GUI should be restarted after installing a plugin. Or maybe ask the user if GUI should restart now.
Bug3:
Also not really a bug, more an eye candy: Plugin "enigma2-plugin-systemplugins-vuplus-ventilatorcontrole" missing translations. I think its only Netherlands.
Bug4:
Plugin "fpga upgrade" shows "Missing file" if you want to download.
Bug5:
This is a very important bug i think. After installing "sherlock 5.1" the FAN is not working!!! The box gets very hot (about 50 degrees) and overheat! This result in pixeling. 
Maybe someone can thes this on other boxes, but as i remember the same happen on VU+ uno (but not 100% sure).