diff --git a/test/units/testsuite-50.mountnfsd.sh b/test/units/testsuite-50.mountnfsd.sh
index d6b5fafeab..fea6b7d50b 100755
--- a/test/units/testsuite-50.mountnfsd.sh
+++ b/test/units/testsuite-50.mountnfsd.sh
@@ -49,6 +49,15 @@ systemd-dissect --image-policy='root=unprotected:=absent+unused' --mtree /var/tm
 (! runas testuser systemd-dissect /var/tmp/unpriv.raw)
 (! runas testuser systemd-dissect --mtree /var/tmp/unpriv.raw)
 
+if (SYSTEMD_LOG_TARGET=console varlinkctl call \
+        /run/systemd/userdb/io.systemd.NamespaceResource \
+        io.systemd.NamespaceResource.AllocateUserRange \
+        '{"name":"test-supported","size":65536,"userNamespaceFileDescriptor":0}' 2>&1 || true) |
+            grep -q "io.systemd.NamespaceResource.UserNamespaceInterfaceNotSupported"; then
+    echo "User namespace interface not supported, skipping mountnfsd/nsresourced tests"
+    exit 0
+fi
+
 # Install key in keychain
 cp /tmp/test-50-unpriv-cert.crt /run/verity.d
 
diff --git a/test/units/testsuite-50.sh b/test/units/testsuite-50.sh
index ab65c86ba8..8c4d2bfc3f 100755
--- a/test/units/testsuite-50.sh
+++ b/test/units/testsuite-50.sh
@@ -134,8 +134,8 @@ fi
 # Make a GPT disk on the fly, with the squashfs as partition 1 and the verity hash tree as partition 2
 #
 # du rounds up to block size, which is more helpful for partitioning
-root_size="$(du -k "$MINIMAL_IMAGE.raw" | cut -f1)"
-verity_size="$(du -k "$MINIMAL_IMAGE.verity" | cut -f1)"
+root_size="$(du --apparent-size -k "$MINIMAL_IMAGE.raw" | cut -f1)"
+verity_size="$(du --apparent-size -k "$MINIMAL_IMAGE.verity" | cut -f1)"
 signature_size=4
 # 4MB seems to be the minimum size blkid will accept, below that probing fails
 dd if=/dev/zero of="$MINIMAL_IMAGE.gpt" bs=512 count=$((8192+root_size*2+verity_size*2+signature_size*2))
diff --git a/test/units/testsuite-50.sysext.sh b/test/units/testsuite-50.sysext.sh
index 8cfa0a485c..3bc88999f8 100755
--- a/test/units/testsuite-50.sysext.sh
+++ b/test/units/testsuite-50.sysext.sh
@@ -4,6 +4,7 @@ set -eux
 set -o pipefail
 
 FAKE_ROOTS_DIR="$(mktemp -d --tmpdir="" fake-roots-XXX)"
+FSTYPE=$(stat --file-system --format "%T" /usr)
 
 shopt -s nullglob
 
@@ -370,6 +371,8 @@ fake_root=${roots_dir:+"$roots_dir/simple-mutable-with-read-only-hierarchy"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -394,6 +397,8 @@ fake_root=${roots_dir:+"$roots_dir/simple-mutable-with-missing-hierarchy"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 move_existing_hierarchy_aside "$fake_root" "$hierarchy"
 prepare_root "$fake_root" "$hierarchy"
 rmdir "$fake_root/$hierarchy"
@@ -418,6 +423,8 @@ fake_root=${roots_dir:+"$roots_dir/simple-mutable-with-empty-hierarchy"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 move_existing_hierarchy_aside "$fake_root" "$hierarchy"
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
@@ -444,6 +451,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_real_dir="$fake_root/upperdir"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_real_dir"
@@ -473,6 +482,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_real_dir="$fake_root$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_real_dir"
@@ -582,6 +593,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_data_dir_usr="$fake_root/var/lib/extensions.mutable/usr"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_read_only_hierarchy "$fake_root" "$hierarchy"
@@ -635,6 +648,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_data_dir_usr="$fake_root/var/lib/extensions.mutable/usr"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_read_only_hierarchy "$fake_root" "$hierarchy"
@@ -687,6 +702,8 @@ fake_root=${roots_dir:+"$roots_dir/auto-mutable-env-var"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -774,6 +791,8 @@ fake_root=${roots_dir:+"$roots_dir/ephemeral"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -798,6 +817,8 @@ fake_root=${roots_dir:+"$roots_dir/ephemeral-env-var"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -822,6 +843,8 @@ fake_root=${roots_dir:+"$roots_dir/ephemeral-import"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -846,6 +869,8 @@ fake_root=${roots_dir:+"$roots_dir/ephemeral-import-env-var"}
 hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_data_dir"
@@ -871,6 +896,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_real_dir="$fake_root$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_real_dir"
@@ -890,6 +917,8 @@ hierarchy=/opt
 extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 extension_real_dir="$fake_root$hierarchy"
 
+[[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
 prepare_root "$fake_root" "$hierarchy"
 prepare_extension_image "$fake_root" "$hierarchy"
 prepare_extension_mutable_dir "$extension_real_dir"
@@ -910,6 +939,8 @@ for mutable_mode in no yes ephemeral; do
     hierarchy=/opt
     extension_data_dir="$fake_root/var/lib/extensions.mutable$hierarchy"
 
+    [[ "$FSTYPE" == "fuseblk" ]] && exit 0
+
     prepare_root "$fake_root" "$hierarchy"
     prepare_extension_image "$fake_root" "$hierarchy"
     prepare_extension_mutable_dir "$extension_data_dir"