Possible Duplicate:
Are “PPA's” safe to add to my system, and what are some “red flags” to watch out for?
Should I trust these packages and ppas on Oneiric Amd64? PPA:
ppa:webupd8team/jupiter
ppa:atareao/atareao
ppa:webupd8team/gnome3
ppa:webupd8team/java
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
Packages from ppa above:
Jupiter gnome-shell-extensions calendar-indicator oracle-java7-installer indicator-weather lo-menubar xscreensaver xscreensaver-gl-extra xscreensaver-data-extra gimp gimp-plugin-registry gimp-resynthesizer
These PPA's you have mentioned are maintained by
Webupd8
is quite a trusted site. They provide proper well made stable packages. Many people (Even me!) use their PPA's. You should not have a problem with their packages. See their home pageUbuntu-x-swat
is also a great team. Here also many people use it (Me also, again!). You can safely use it but do not forget to read the instructions hereatareao
: I have never used their PPA but searching around on the net gives a hint that they are a bit trusted and also recommended by some sites.Generally most PPA's you find should be stable with no "evil" in them. Just to be sure keep a point in mind to add a PPA only if some sites recommend them. Also make sure to add only stable version of a PPA. Some PPA's provide development versions which might thrash your PC if they are buggy. So in the end the choice is yours.
Its upto you whether you are going to trust any of the untrusted PPA's. I mean to say the risk level depends on youselves.