Comment 6 for bug 1904475

Got the same issue. Might be related to the fact that I am connecting the desktop to a hotspot only after the system is up. I get the categories only after I do a "killall snap-store". From syslog:

Jul 21 09:34:46 moshe snap-store[1878]: not GsPlugin error snapd-error-quark:10: status-code=500 kind=(null) message=Get https://api.snapcraft.io/api/v1/snaps/sections: dial tcp: lookup api.snapcraft.io: no such host
Jul 21 09:34:46 moshe snap-store[1878]: failed to get categories: no categories to show
Jul 21 09:34:46 moshe snap-store[1878]: not handling error failed for action get-categories: status-code=500 kind=(null) message=Get https://api.snapcraft.io/api/v1/snaps/sections: dial tcp: lookup api.snapcraft.io: no such host
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Builder.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Calculator.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.clocks.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Dictionary.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Documents.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: Only 0 apps for recent list, hiding
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Evince/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.gedit.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Maps.desktop/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: adding wildcard app */*/*/*/org.gnome.Weather/* to plugin cache
Jul 21 09:34:46 moshe snap-store[1878]: not handling error failed for action get-featured: lookup api.snapcraft.io: no such host
Jul 21 09:34:46 moshe snap-store[1878]: hiding category audio-video featured applications: found only 0 to show, need at least 9
Jul 21 09:34:46 moshe snap-store[1878]: hiding category graphics featured applications: found only 0 to show, need at least 9
Jul 21 09:34:46 moshe snap-store[1878]: not handling error failed for action get-category-apps: lookup api.snapcraft.io: no such host
Jul 21 09:34:47 moshe snap-store[1878]: Failed to find refreshable snaps: status-code=500 kind=(null) message=cannot list updates: Post https://api.snapcraft.io/v2/snaps/refresh: dial tcp: lookup api.snapcraft.io: no such host