ubuntu配置ROS失败 之后updatte失败 求解决办法

Err http://trusty main InRelease                                              
  
Err http://trusty main Release.gpg                                            
  Could not resolve 'trusty'
Err http://ports.ubuntu.com trusty InRelease                                  
  
Err http://ports.ubuntu.com trusty-updates InRelease
  
Err http://ports.ubuntu.com trusty-security InRelease
  
Err http://ports.ubuntu.com trusty-proposed InRelease
  
Err http://ports.ubuntu.com trusty-backports InRelease
  
Err http://ports.ubuntu.com trusty Release.gpg
  Could not resolve 'ports.ubuntu.com'
Err http://ports.ubuntu.com trusty-updates Release.gpg
  Could not resolve 'ports.ubuntu.com'
Err http://ports.ubuntu.com trusty-security Release.gpg
  Could not resolve 'ports.ubuntu.com'
Err http://ports.ubuntu.com trusty-proposed Release.gpg
  Could not resolve 'ports.ubuntu.com'
Err http://ports.ubuntu.com trusty-backports Release.gpg
  Could not resolve 'ports.ubuntu.com'
Fetched 4,031 B in 40s (100 B/s)
Reading package lists... Done
W: GPG error: http://packages.ros.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5523BAEEB01FA116
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty/InRelease  


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-updates/InRelease  


W: Failed to fetch http://trusty/dists/main/InRelease  


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-security/InRelease  


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-proposed/InRelease  


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-backports/InRelease  


W: Failed to fetch http://trusty/dists/main/Release.gpg  Could not resolve 'trusty'


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


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


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-security/Release.gpg  Could not resolve 'ports.ubuntu.com'


W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/trusty-proposed/Release.gpg  Could not resolve 'ports.ubuntu.com'


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


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