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For the last few days, when I run sudo apt-get update, it fails because some of the hosts cannot be resolved. However, I can ping them, so they definitely are getting resolved. My internet is working great. I also have that red ! in a triangle up in the corner.

Here is a sample of the output from apt-get:

steve@steve-ub:~$ sudo apt-get update
Ign http://ppa.launchpad.net trusty InRelease                                                                                 
Hit http://ppa.launchpad.net trusty Release.gpg                                                                               
Hit http://ppa.launchpad.net trusty Release                                                                                   
Hit http://ppa.launchpad.net trusty/main amd64 Packages                                                                       
Hit http://ppa.launchpad.net trusty/main i386 Packages                                                                        
Ign http://ppa.launchpad.net trusty/main Translation-en_US                                                                    
Ign http://ppa.launchpad.net trusty/main Translation-en                                                                       
Err http://repo.steampowered.com precise InRelease                                                                            

Err http://repo.steampowered.com precise Release.gpg                                                                          
  Could not resolve 'repo.steampowered.com'
Err http://archive.canonical.com trusty InRelease                                                                             

Err http://extras.ubuntu.com trusty InRelease                                                                                 

Err http://us.archive.ubuntu.com trusty InRelease                                                                             

I cut some of the output here, continuing later:

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/trusty-backports/Release.gpg  Could not resolve 'us.archive.ubuntu.com'

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg  Could not resolve 'dl.google.com'

W: Some index files failed to download. They have been ignored, or old ones used instead.

And yet, I can ping the hosts that could not be resolved:

steve@steve-ub:~$ ping us.archive.ubuntu.com
PING us.archive.ubuntu.com (91.189.91.14) 56(84) bytes of data.
64 bytes from orobas.canonical.com (91.189.91.14): icmp_seq=1 ttl=49 time=59.8 ms

...

steve@steve-ub:~$ ping repo.steampowered.com
PING user-att-75-46-72-0.a1507.d.akamai.net (23.72.83.64) 56(84) bytes of data.
64 bytes from a23-72-83-64.deploy.static.akamaitechnologies.com (23.72.83.64): icmp_seq=1 ttl=56 time=20.8 ms

How can I get updates to work again?

share|improve this question
2  
choose a different server from software and updates. –  Avinash Raj Jun 18 at 2:00
    
That has appeared to resolve all but repo.steampowered.com. Why, though? Those servers from the question are online... And since Steam doesn't work, I think if I knew that, I could fix Steam. –  Steve Jun 18 at 2:11
    
Why are you trying to use precise repos on trusty? –  Registered User Jun 18 at 7:13
    
If you're talking about the Steam repo, I don't believe they even have one for trusty. –  Steve Jun 18 at 14:12

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