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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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Severus Tux
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Bhavesh Khatnani
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  • you may try updating first `sudo apt-get update && sudo apt-get install unity-tweak-tool` or use a graphical manager instead, like synaptic. – Kev Inski Jun 03 '16 at 06:39
  • @KevInski Didn't worked. Maybe there is some other problem. I got this at the end of update::: W: There is no public key available for the following key IDs: 1397BC53640DB551 – Bhavesh Khatnani Jun 03 '16 at 07:20
  • Please post text files and program output listings as text, not as images (see [How do I save terminal output to a file?](//askubuntu.com/q/420981/175814)). – David Foerster Jun 05 '16 at 08:38

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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

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zhenguoli
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  • Thanks! It's installed, but I still get that message in end that no public key available. Is it fine? – Bhavesh Khatnani Jun 03 '16 at 12:32
  • This `no public key` problem may be answered in the [How do I fix the GPG error "NO_PUBKEY"?](http://askubuntu.com/questions/13065/how-do-i-fix-the-gpg-error-no-pubkey), I have no idea about this, sorry. – zhenguoli Jun 03 '16 at 12:56