trinitydesktop.org and ppa.quickbuild.pearsoncomputing.net seem to be
switching online and offline at random. I am able to access them right
now via Firefox, and apt-get update finally worked, but they were not
responding earlier. Also, ping to trinitydesktop.org does not work,
has not worked for the last few hours, and is still not working. Any
ideas what's going on?

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Kristopher Gamrat