I wanted to upgrade to 16.04 from 14.04, so I run the command
sudo do-release-upgrade -d
Initially it was running smooth. During the upgrade, unfortunately I clicked the mouse over one underlying window on the screen. Strangely, the window did not come above. Instead I found the upgrade process was stopped. This was unexpected effect really. A message appeared to warn me the screen would go into very low resolution or something like that, then I was asked whether I wanted to repair or would continue, so I selected continue. Subsequently then another message told me that the screen would sleep for 1 minute.
I really waited for about 1 hour without any change on the screen that now turned to monochrome before I realized that the upgrade was broken.
After hard reset, it managed to boot but only in console mode (like Linux many years ago I used). I can log in using ordinary user account and can do su work, but I found that only loop back device was appeared, not eth0 nor wifi device.
So please anyone would tell me how to continue installing failed upgrade. Please do not suggest a fresh install, because I have many material inside.
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