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(Note: no disrespect whatever to the hard work people that people who run 3rd-party repositories put in.)
I came across a package repository, a ppa, that was suggested for getting php5.5 on Ubuntu 12.04. This has to be added to the list of repositories that Ubuntu knows to download software.
In general, can such 3rd-party repositories be trusted?
In this particular case, the ppa seems to be well regarded - and I would certainly want to support this and recommend it.
Is there a checklist or criteria one can follow to arrive at a decision to trust a 3rd-party repository?
The aim here is to avoid downloading malware or anything else that may damage the computer.