Ubuntu Source List Generator
So you have messed too much with 3rd party PPAs & now you want to get your "old" repos back then check this website : #-Link-Snipped-#
This website will allow you to create the new source list.After filling up desired choices click on "generate" in end of page & new page will generate something like :

Now open terminal & type :
Now type in terminal :
This website will allow you to create the new source list.After filling up desired choices click on "generate" in end of page & new page will generate something like :

Now open terminal & type :
gksudo gedit /etc/apt/sources.list& then copy-paste the generated source list from website & hit on "save".
Now type in terminal :
sudo apt-get update👍
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