When I start my HP laptop, I see double GRUB window. Sometimes I must start up and shut down the laptop for 10-20 times until it runs correctly.
There is also a problem with shutting down the laptop. When I work on the laptop more than a few minutes, sometimes shut down takes over 5-10 mins. I didn't have this problem since upgraded from Ubuntu 17, only from few weeks (maybe it's because of some Ubuntu update?). It’s really annoying, maybe somebody has the solution?