Data files for some packages could not be downloaded - font instalation

Solution 1:

Close Software Center

Type this in terminal

sudo lsof /var/lib/dpkg/lock

Identify the PID of the process causing lock then stop that process

sudo kill -TERM <PID>

sudo apt-get update && sudo apt-get upgrade

sudo apt-get install ttf-mscorefonts-installer

Using the old command:

sudo apt-get install msttcorefonts

for installing Times New Roman font in Ubuntu 14.04.

If you're already tried using ttf-mscorefonts-installer, please reinstall the font using:

sudo apt-get --reinstall install msttcorefonts

It works for me.