Open the terminal (Applications > Accesories > Terminal) and write (password 
required):
sudo gedit /etc/apt/sources.list
Delete the next part  [1], save it a write: sudo apt-get update After that this 
problem must be fixed.
Thanks in advance.
[1]
usage: sudo -h | -K | -k | -L | -V
usage: sudo -v [-AknS] [-p prompt]
usage: sudo -l[l] [-AknS] [-g groupname|#gid] [-p prompt] [-U username] [-u
            username|#uid] [-g groupname|#gid] [command]
usage: sudo [-AbEHknPS] [-C fd] [-g groupname|#gid] [-p prompt] [-u
            username|#uid] [-g groupname|#gid] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-C fd] [-g groupname|#gid] [-p prompt] [-u
            username|#uid] file ...

** Changed in: update-manager (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/744961

Title:
  E:Type 'usage:' is not known on line 61 in source list
  /etc/apt/sources.list

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