apt - How can I remove all PPA?

I noticed that

sudo apt-get update

takes longer and longer, because i used several

sudo apt-add-repository xxx

it seems like non ubuntu repositories are not as fast or dont have as much bandwith as the default ones.

How can i reset the repositories to the default ones, removing all the ones added by me? (not to worry, if ever need any of them i can add them later)

To delete and purge all PPAs:

The ppa-purge removes the PPA and tries to replace the installed packages with the version of the Officially Ubuntu Repositories

1. Install ppa-purge

   
   

   sudo apt-get install ppa-purge
   




2. List the commands to be used with the command below. This command does nothing than print the commands to be used in the next step

   
   

   find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
       while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/ {print "sudo ppa-purge ppa:"$4"/"$5}' "$file"; done
   




3. Check the previous output and if all is ok, fire the purge-commands by the command below

   
   

   find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
       while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/ {system("sudo ppa-purge ppa:"$4"/"$5)}' "$file"; done
   

---

Sample output

% find /etc/apt/sources.list.d -type f -name "*.list" -print0 | while read -d $'\0' file; do awk -F/ '/deb / && /launchpad/ {print "sudo ppa-purge ppa:"$4"/"$5}' "$file"; done
sudo ppa-purge ppa:yannubuntu/boot-repair
sudo ppa-purge ppa:bugs-launchpad-net-falkensweb/cool-retro-term
sudo ppa-purge ppa:andreas-boettger/gmusicbrowser-art
sudo ppa-purge ppa:yorba/ppa
sudo ppa-purge ppa:libreoffice/libreoffice-prereleases
sudo ppa-purge ppa:ricotz/testing
sudo ppa-purge ppa:nilarimogard/webupd8
sudo ppa-purge ppa:andreas-boettger/private
sudo ppa-purge ppa:snappy-dev/beta
sudo ppa-purge ppa:diesch/testing
sudo ppa-purge ppa:webupd8team/tor-browser
sudo ppa-purge ppa:musicbrainz-developers/stable
sudo ppa-purge ppa:latexila/ppa
sudo ppa-purge ppa:gencfsm/ppa
sudo ppa-purge ppa:webupd8team/java
sudo ppa-purge ppa:minecraft-installer-peeps/minecraft-installer
sudo ppa-purge ppa:gnome3-team/gnome3-staging
sudo ppa-purge ppa:git-core/ppa
sudo ppa-purge ppa:stackapplet-dev/stackapplet
sudo ppa-purge ppa:linuxgndu/sqlitebrowser
sudo ppa-purge ppa:webupd8team/atom
sudo ppa-purge ppa:webupd8team/unstable
sudo ppa-purge ppa:gnome3-team/gnome3
sudo ppa-purge ppa:webupd8team/y-ppa-manager
sudo ppa-purge ppa:team-xbmc/ppa
sudo ppa-purge ppa:peterlevi/ppa
sudo ppa-purge ppa:stebbins/handbrake-snapshots
sudo ppa-purge ppa:noobslab/apps
sudo ppa-purge ppa:numix/ppa
sudo ppa-purge ppa:dreibh/ppa
sudo ppa-purge ppa:saiarcot895/flightgear
sudo ppa-purge ppa:andreas-boettger/gmusicbrowser-daily
sudo ppa-purge ppa:xorg-edgers/ppa