Using base: requires KVM and none of my build machines support that (because too old or a VM)

build.xml

@@ -600,7 +600,9 @@
 			<fileset dir="${dir.base}" includes="**/bin/**" />
 		</chmod>
 
-		<exec executable="snapcraft" dir="${dir.staging}" failonerror="yes" />
+		<exec executable="snapcraft" dir="${dir.staging}" failonerror="yes">
+			<arg line="cleanbuild" />
+		</exec>
 	</target>
 
 

installer/snap/snapcraft.yaml

@@ -5,7 +5,6 @@ description: @{package.description}
 
 confinement: strict
 grade: stable
-base: core18
 
 architectures: [amd64]