root@ubuntu:/# apt-get update
Err
http://debootstrap.invalid maverick Release.gpg
Could not resolve 'debootstrap.invalid'
Err
http://debootstrap.invalid/ maverick/main Translation-en
Could not resolve 'debootstrap.invalid'
Err
http://debootstrap.invalid/ maverick/restricted Translation-en
Could not resolve 'debootstrap.invalid'
Reading package lists... Done
W: Failed to fetch
http://debootstrap.invalid/dists/maverick/Release.gpg Could not resolve 'debootstrap.invalid'
W: Failed to fetch
http://debootstrap.invalid/dists/maverick/main/i18n/Translation-en.gz Could not resolve 'debootstrap.invalid'
W: Failed to fetch
http://debootstrap.invalid/dists/maverick/restricted/i18n/Translation-en.gz Could not resolve 'debootstrap.invalid'
W: Some index files failed to download, they have been ignored, or old ones used instead.
root@ubuntu:/# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@ubuntu:/# apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.