Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: youtube-dl 0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded. Need to get 237 kB of archives. After this operation, 1,106 kB of additional disk space will be used. Get:1 http://in.archive.ubuntu.com/ubuntu/ trusty/universe youtube-dl all 2014.02.17-1 [237 kB] Fetched 5,080 B in 3s (1,450 B/s) E: Failed to fetch http://in.archive.ubuntu.com/ubuntu/pool/universe/y/youtube-dl/youtube-dl_2014.02.17-1_all.deb Size mismatch E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
The package is likely outdated so useless. You should just install manually & update every couple of weeks or if it breaks.
Instructions here - https://rg3.github.io/youtube-dl/download.html
Most common method -
sudo curl https://yt-dl.org/downloads/2016.05.10/youtube-dl -o /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl
sudo youtube-dl -U
youtube-dl version in the default repositories is outdated. To install the more current one - open a terminal and execute the following commands :
sudo apt-add-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install youtube-dl
Additionally (as @Ron mentioned in his comment under your question), to fix the errors execute :
sudo apt-get clean && sudo apt-get update && sudo apt-get install --fix-missing