How To Re-Install Ubuntu

You may accidentally have corrupted your or misconfigured something in your ubuntu installation.
OR in case you had an unfortunate unsuccessful upgrade and their was no backup made or done.

Their are two commands that you can use reinstall ubuntu:-

1-You can  use this command and run it in your terminal:-

sudo dpkg-reconfigure -phigh -a

This will install ubuntu like a fresh installation and reconfigures each and every package completely and automatically.

Note:- This will take sometime as a whole new installation of ubuntu will be done.
2-Or you can run this command in your terminal

sudo apt-get install -f

This will come handy in case  some minor problems errors have ocurred.