I was upgrading Ubuntu from 14.04 to 16.04, but the upgrade stopped halfway through because there was not enough space on the disk. I tried freeing up some space and upgrading again, but it still didn't work. I then shut the computer down, and when I started it the next day, logging in would send me to a black screen and then kick me back out to the login window. This seems to be a common problem with failed upgrades.
I tried going into the text screen to finish the upgrade, but it seems that Ubuntu cannot find any network connections. I have ethernet and wifi connections, both of which I have confirmed to be working with another computer and on the Windows 7 OS on the same laptop that I am having issues with.
I called the
nmcli dev wifi command from the terminal, but no connections came up. Does anyone have any suggestions for how to access the networks from the terminal, or have any ideas as to what the problem may be?