Installation of Unity-tweak-tool is stuck at 0% and showing nothing. I've to press CTRL+C to stop. I've checked internet connection and it is working fine.
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            I have encountered the problem ever, the reason is that it use the IPv6 address to access the software repository, but I found the apt-get may can't handle the IPv6 address properly, so you should use the IPv4 address instead.
You can try sudo apt-get -o Acquire::ForceIPv4=true install unity-tweak-tool
Here are some materials about Force Apt-Get to IPv4 or IPv6 on Ubuntu or Debian

 
     
     
    