I always get a timeout, when trying to find something.
Resolving api.snapcraft.io… 91.189.92.19, 91.189.92.20 Connecting to api.snapcraft.io|91.189.92.19|:443… connected. HTTP request sent, awaiting response… 500 INTERNAL SERVER ERROR 2017-09-22 16:55:52 ERROR 500: INTERNAL SERVER ERROR.
What version of snap do you have installed? Can you please run snap version and paste the output here? Do you have an ‘interesting’ network setup? Behind a corporate or country proxy or something?
snap version
snap 2.27.5+17.04 snapd 2.27.5+17.04 series 16 ubuntu 17.04 kernel 4.10.0-35-generic