I have the same issue in Pop OS 20.10. It looks like the store doesn’t provide it’s own styling and instead relies on the styling of the OS. I uninstalled and reinstalled snap store and managed to get it to run but have the following errors in the log:
snap-store
Warning: Schema “org.gnome.system.locale” has path “/system/locale/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy” has path “/system/proxy/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.http” has path “/system/proxy/http/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.https” has path “/system/proxy/https/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.ftp” has path “/system/proxy/ftp/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.socks” has path “/system/proxy/socks/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
16:33:00:0496 Gtk Failed to load module "appmenu-gtk-module"
16:33:00:0604 Gtk Theme parsing error: gtk.css:1:0: Failed to import: Error opening file /var/lib/snapd/hostfs/usr/share/themes/Pop-dark/gtk-3.20/gtk.css: Permission denied
16:33:00:0610 Gtk Failed to load module "canberra-gtk-module"
16:33:00:0620 Gtk Failed to load module "canberra-gtk-module"
16:33:00:0978 GsPluginOdrs failed to get distro name: Failed to open file “/var/lib/snapd/hostfs/etc/os-release”: Permission denied
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0512 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0513 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0514 XbSilo xb_builder_node_unlink: assertion 'XB_IS_BUILDER_NODE (self)' failed
16:33:02:0711 Gs plugin appstream took 1.7 seconds to do setup
16:33:02:0715 Gs enabled plugins: desktop-categories, fwupd, packagekit, packagekit-local, packagekit-offline, packagekit-proxy, packagekit-refine-repos, packagekit-refresh, packagekit-upgrade, packagekit-url-to-app, appstream, desktop-menu-path, hardcoded-blacklist, hardcoded-popular, modalias, odrs, packagekit-refine, rewrite-resource, packagekit-history, provenance, snap, systemd-updates, generic-updates, provenance-license, icons, key-colors, key-colors-metadata
16:33:02:0715 Gs disabled plugins: dpkg, dummy, fedora-langpacks, fedora-pkgdb-collections, os-release, repos
16:33:03:0804 Gs /etc/PackageKit/Vendor.conf file not found
16:33:11:0016 Gs not GsPlugin error g-number-parser-error-quark:1: failed to call gt(): Number “201906091949” is out of bounds [0, 4294967295]
16:33:11:0016 Gs not handling error failed for action get-recent: failed to call gt(): Number “201906091949” is out of bounds [0, 4294967295]
16:33:11:0016 Gs Only 0 apps for recent list, hiding
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Builder.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Calculator.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.clocks.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Dictionary.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Documents.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Evince/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.gedit.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Maps.desktop/* to plugin cache
16:33:11:0017 Gs adding wildcard app */*/*/*/org.gnome.Weather/* to plugin cache
16:33:11:0082 Gs hiding category games featured applications: found only 0 to show, need at least 9
16:33:11:0106 Gs hiding category productivity featured applications: found only 0 to show, need at least 9
16:33:11:0929 Gs failed to create an app for */*/*/*/system/*
16:33:11:0961 Gs failed to create an app for */*/*/*/system/*
16:33:11:0961 Gs failed to get system app
16:33:12:0030 Gs automatically prevented from changing kind on system/package/*/generic/io.elementary.granite/* from generic to unknown!
16:33:15:0098 Gs automatically prevented from changing kind on system/snap/*/runtime/io.snapcraft.core18-CSO04Jhav2yK0uz97cr0ipQRyqg0qQL6/latest/stable from runtime to unknown!