Experiencing the same thing as krupier123 on Ubuntu 14.10. I have tried
all workarounds mentioned here. Reinstalling NetworkManager fixes the
issue for a couple of minutes, then the connection dies again.
Rebooting, suspending, setting managed=true in NetworkManager.conf does
not do anything.
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I have a similar problem: black screen directly after first boot, but
then at the second, a puple screen appears and tells me that Ubuntu
could not mount my harddrive. (Ubuntu is installed on a SSD). I then
proceed without having it mounted and the harddrive then appears one
minute later. This happ