AH01797: client denied by server configuration

If you get this message in your logs, it means mentioned Directory or File has been prohibited by server configuration. 

You have mentioned that this directory or file should not be accessible by user.

In many cases, most common forbidden file is xmlrpc.php of wordpress because it may be one reason of DDOS attack. That's why system administrators block this file to access using GET method.

Other forbidden object can be uploads or config directory.

Font - Text has turned into boxes in Ubuntu 16.04

Without any cause all text has turned into boxes 'rectangles' everywhere in Ubuntu 16.04.
find /usr/share/fonts -iname '*.ttf' -type f -exec sudo chmod -v 644 {} \;
find /usr/share/fonts -iname '*.otf' -type f -exec sudo chmod -v 644 {} \;
sudo fc-cache -r -v

Python error while installing any package on Ubuntu

Error :
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

Solution :
sudo apt-get clean
sudo apt-get update
sudo apt-get install --reinstall python-minimal python-lockfile

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