Add base snap core18 because of ubuntu 20.04.04…

_download_snaps.sh

@@ -2,7 +2,7 @@
 
 OUTPUT_DIR=$1
 
-for snap2install in core20 core gnome-3-28-1804 gnome-3-38-2004 chromium teams teams-for-linux zoom-client skype discord telegram-desktop inkscape
+for snap2install in core18 core20 core gnome-3-28-1804 gnome-3-38-2004 chromium teams teams-for-linux zoom-client skype discord telegram-desktop inkscape
 do
 	echo download $directory
 	snap download $snap2install --target-directory ${OUTPUT_DIR}/

setup/snaps/_install_all_snaps.sh

@@ -11,6 +11,9 @@ SNAPS=$(printf "%s " "${SNAPS_ARR[@]}")
 snap ack core.assert
 snap install core.snap
 
+snap ack core18.assert
+snap install core18.snap
+
 snap ack core20.assert
 snap install core20.snap