~$ apt-get install ffmpeg
E: Could not open lock file /var/lib/dpkg/lock - open (13 Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
gsalvini@patagonia:~$ sudo apt-get install ffmpeg
Reading package lists... Done
Building dependency tree       
Reading state information... Done
ffmpeg is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Setting up k3d (0.5.12.0-1ubuntu2) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1348, in ?
    main()
  File "/usr/bin/pycentral", line 1342, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 865, in run
    pkg.read_version_info()
  File "/usr/bin/pycentral", line 535, in read_version_info
    raise PyCentralError, "package has no field Python-Version"
__main__.PyCentralError: package has no field Python-Version
dpkg: error processing k3d (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 k3d
E: Sub-process /usr/bin/dpkg returned an error code (1)