+# these get copied in an earlier stage by fai, but leaving it here since
+# I run this as a single post-fai script to update things that have changed.
+fcopy -riB /etc/apt
+# outside of fai, this seems to regularly lead to
+# E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
+# so add a sleep. 1 sec is probably way more than needed.
+sleep 1
+$ROOTCMD apt-get update