shark@shark-Latitude-E6410:~$ sudo apt-get purge youtube-dl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  intltool libav-tools libenca0 libfakekey0 libguess1 libqca-qt5-2 libqca-qt5-2-plugins libqqwing2v5 libsdl2-2.0-0 libva-wayland1 linux-headers-4.8.0-22 linux-headers-4.8.0-22-generic
  linux-headers-4.8.0-26 linux-headers-4.8.0-26-generic linux-headers-4.8.0-27 linux-headers-4.8.0-27-generic linux-headers-4.8.0-28 linux-headers-4.8.0-28-generic linux-image-4.4.0-42-generic
  linux-image-4.8.0-22-generic linux-image-4.8.0-26-generic linux-image-4.8.0-27-generic linux-image-4.8.0-28-generic linux-image-extra-4.4.0-42-generic linux-image-extra-4.8.0-22-generic
  linux-image-extra-4.8.0-26-generic linux-image-extra-4.8.0-27-generic linux-image-extra-4.8.0-28-generic mpv python-distutils-extra rtmpdump
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  youtube-dl*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 4,014 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 412955 files and directories currently installed.)
Removing youtube-dl (2016.06.25-2) ...
Processing triggers for man-db (2.7.5-1) ...
(Reading database ... 412297 files and directories currently installed.)
Removing youtube-dl (2016.06.25-2) ...
Purging configuration files for youtube-dl (2016.06.25-2) ...
shark@shark-Latitude-E6410:~$ sudo apt-get install youtube-dl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  intltool libfakekey0 libqca-qt5-2 libqca-qt5-2-plugins libqqwing2v5 linux-headers-4.8.0-22 linux-headers-4.8.0-22-generic linux-headers-4.8.0-26 linux-headers-4.8.0-26-generic linux-headers-4.8.0-27
  linux-headers-4.8.0-27-generic linux-headers-4.8.0-28 linux-headers-4.8.0-28-generic linux-image-4.4.0-42-generic linux-image-4.8.0-22-generic linux-image-4.8.0-26-generic
  linux-image-4.8.0-27-generic linux-image-4.8.0-28-generic linux-image-extra-4.4.0-42-generic linux-image-extra-4.8.0-22-generic linux-image-extra-4.8.0-26-generic linux-image-extra-4.8.0-27-generic
  linux-image-extra-4.8.0-28-generic python-distutils-extra
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  youtube-dl
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/729 kB of archives.
After this operation, 4,014 kB of additional disk space will be used.
Selecting previously unselected package youtube-dl.
(Reading database ... 412294 files and directories currently installed.)
Preparing to unpack .../youtube-dl_2016.06.25-2_all.deb ...
Unpacking youtube-dl (2016.06.25-2) ...
Setting up youtube-dl (2016.06.25-2) ...
Processing triggers for man-db (2.7.5-1) ...
shark@shark-Latitude-E6410:~$ youtube-dl -U
Updating to version 2016.12.22 ...
ERROR: no write permissions on /usr/local/bin/youtube-dl