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My computer crashed while I was upgrading from Ubuntu 14.04 to 16.04.

In order to resume the upgrade, I followed the steps in the tutorial Rescuing an Interrupted Ubuntu Upgrade, which seems quite useful.

Everything worked fine when I ran the command:

dpkg --configure -a

But when I ran the command

sudo apt-get update && sudo apt-get upgrade

, I get the following error message (I could only take a picture of it as in that computer only the terminal is working)

screenshot of "Temporary failure resolving" errors from APT

Basically it is saying that it failed to resolve a few packages (e.g. temporary failure to resolve 'gb.archive.ubuntu.com')

I have then found something at apt-get update fails to fetch files, “Temporary failure resolving …” error, which I believe is pretty much what I have been experiencing (failure DURING dist upgrade).

However, I noticed that ALL the entries from my sources.list have the name "xenial" after it, therefore I'm afraid closing all the entries from my source.list is not the best option. A picture of my sources.list file can be found below:

screenshot showing contents of sources.list in a terminal-based text editor

Or do anyone of you believe it can be a temporary DNS issue? Or any other thoughts (I have a feeling it has something to do with my sources.list)?

Eliah Kagan
  • 117,780
BCArg
  • 427

1 Answers1

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The sources.list seems fine and its most likely an issue with the DNS.

You can add 8.8.8.8 as your temporary DNS and see if it helps by running the following command

echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null

Then run the following

sudo apt-get -f install 
sudo apt-get update
sudo apt-get upgrade

If this fixes your temporary resolving messages then either wait and see if your ISP fixes the issue for you or you can permanently add a DNS server to your system:

echo "nameserver 8.8.8.8" | sudo tee /etc/resolvconf/resolv.conf.d/base > /dev/null

8.8.8.8 is Google's own DNS server.

Elson D'souza
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  • I restarted the computer and it was working (graphical interface was now working and Ubuntu 16.04 was installed). I finished a few updates from the software manager and it seems everything OK. – BCArg Dec 19 '16 at 11:14