diff --git a/install.sh b/install.sh
index 4bf86ce..0ea4500 100644
--- a/install.sh
+++ b/install.sh
@@ -983,7 +983,12 @@ function sudoer_check {
     # Check that the user who launched the installer is on the sudoers list.
 
     # Tails allows sudo without the user `amnesia` being on sudoers list.
-    if ! lsb_release -a 2>/dev/null | grep -q Tails; then
+    if grep -q "Tails" /etc/os-release; then
+        return
+    fi
+
+    # QubesOS also allows sudo without the user `user` being on sudoers list.
+    if [ -d "/etc/qubes-rpc" ]; then
         return
     fi
 
diff --git a/install.sh.asc b/install.sh.asc
index 0921fae..345f8a4 100644
--- a/install.sh.asc
+++ b/install.sh.asc
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
-iQIzBAABCgAdFiEEbab1Q2VetFRTHbYIAsu63k/6kOYFAmYEb9IACgkQAsu63k/6
-kOa+vw/9GMUd9ujxCjJi8SrM/2RIiWGVAvDOgPOLOLsxsxdYe6YqIqCRH+qJ+JiJ
-4+iLsqcTfY+E/EJg3wRFVbuCy5dtX+dfETEkBRmAhKGWV/8qcZSvx++B8w1K7p94
-fqqYq2c3CMgnJZgl/U+YjMl8GFb2i6PkklqjG6U9NbwBHypMRKimH2OSQKMNq88G
-yjLi9XcklkWwXq8vZiU1izICVnJzTDF3J/oB5dbkZ/TyQs9S03qDlgg69ray3YaA
-fv184PduXyNMd1RAUUusD/C0rcX7s97EsxOmzymDMwmHFoLf4vfe0z7eL4vVQrga
-Tb82iamGZIns2uXG7GFDpvxlrgGXdthGXBx2gJksoZr4b5y1//kcqq9WSUjj1zPW
-Bm+FYPNYJ6JdpB4k74XCKn5p5aHzA1CJK9fHG85i1UPit2uk/1fVNKLr8eJM1ERh
-WHhpmAFtBlMq9mSm9mvWQ7VaepsoyBQzg32LurG0Iu6urP3RKi/2gQMnTFrau+tP
-kuMU6m8USvAxtBUTmOgvM+zhjiYla7fDVqgWXlN1fCbIf1gf8vxcbI8JE9Xc9QN/
-9MGihV3o09rTVWAOR5q93lRydDH6HzFs2gYFKTF1MNSKLb8C+d80UmX68r5hA/Jz
-0sdZx9VpHx/9g1p5hLTnsZ5pSQddsvLbLVwRopSZzX0LKXg6+ZE=
-=rWPo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+=YgYu
 -----END PGP SIGNATURE-----