Merge pull request #1446 from pi-hole/tweak/install_lockcheck

Clarify error message on apt failures.

automated install/basic-install.sh

@@ -86,7 +86,7 @@ if command -v apt-get &> /dev/null; then
   #Debian Family
   #############################################
   PKG_MANAGER="apt-get"
-  UPDATE_PKG_CACHE="test_dpkg_lock; ${PKG_MANAGER} update"
+  UPDATE_PKG_CACHE="${PKG_MANAGER} update"
   PKG_INSTALL=(${PKG_MANAGER} --yes --no-install-recommends install)
   # grep -c will return 1 retVal on 0 matches, block this throwing the set -e with an OR TRUE
   PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true"