diff --git a/setup.sh b/setup.sh
index 7cd5e3e..b1a915b 100644
--- a/setup.sh
+++ b/setup.sh
@@ -7,6 +7,10 @@ declare zpool_name zfs_arch_dataset_name
 zpool_name='zpool'
 zfs_arch_dataset_name='archlinux'
 
+# https://unix.stackexchange.com/a/48550
+set -E
+trap '[ "$?" -ne 77 ] || exit 77' ERR
+
 function set_ntp () {
     timedatectl set-ntp true
 }
@@ -56,8 +60,8 @@ function get_parts () {
             parts="$(get_partitions | jq --raw-output '.[][] | select(.parttype=="c12a7328-f81f-11d2-ba4b-00a0c93ec93b") | .path')" || exit 1
             ;;
         *)
-            printf -- '%s\n' 'Unknown partition type '"'"'"${parttype}"'"'"', exiting 1 ...'
-            exit 1
+            >2 printf -- '%s\n' 'Unknown partition type '"'"'"${parttype}"'"'"', exiting 1 ...'
+            exit 77
             ;;
     esac
     printf -- '%s' "${parts}"
@@ -72,8 +76,8 @@ function we_have_exactly_one_part () {
     if [[ "$(wc -c <<<"${parts_list}")" -gt '1' ]]; then
         case "${parts_count}" in
             0)
-                printf -- '%s\n' 'No '"${parttype^^}"' partition found. Exiting 1 ...'
-                exit 1
+                >2 printf -- '%s\n' 'No '"${parttype^^}"' partition found. Exiting 1 ...'
+                exit 77
                 ;;
             1)
                 return 0
@@ -82,8 +86,8 @@ function we_have_exactly_one_part () {
                 return 1
                 ;;
         esac
-        printf -- '%s\n' 'Partition list does not look valid. Cowardly exiting 1 ...'
-        exit 1
+        >2 printf -- '%s\n' 'Partition list does not look valid. Cowardly exiting 1 ...'
+        exit 77
     fi
 }
 
@@ -94,8 +98,8 @@ function get_drive_id () {
         printf -- '%s' "${drive_id}"
         return 0
     fi
-    printf -- '%s\n' 'Not exactly one '"'${1:?}'"' partition entry in /dev/disk/by-id, exiting 1 ...'
-    exit 1
+    >2 printf -- '%s\n' 'Not exactly one '"'${1:?}'"' partition entry in /dev/disk/by-id, exiting 1 ...'
+    exit 77
 }
 
 function select_part () {