diff -Nru linux-restricted-modules-5.4.0/debian/changelog linux-restricted-modules-5.4.0/debian/changelog
--- linux-restricted-modules-5.4.0/debian/changelog	2020-04-22 16:03:46.000000000 +0000
+++ linux-restricted-modules-5.4.0/debian/changelog	2020-04-22 21:43:55.000000000 +0000
@@ -1,3 +1,10 @@
+linux-restricted-modules (5.4.0-26.30+2) focal; urgency=medium
+
+  * /bin/in-target check is flawed as it does not tell the difference
+    between live-session and in-target chroot. (LP: #1874278)
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Wed, 22 Apr 2020 22:43:55 +0100
+
 linux-restricted-modules (5.4.0-26.30+1) focal; urgency=medium
 
   * Can't install any packages with ubuntu-drivers using ubuntu-drivers when
diff -Nru linux-restricted-modules-5.4.0/debian/templates/nvidia.postinst.in linux-restricted-modules-5.4.0/debian/templates/nvidia.postinst.in
--- linux-restricted-modules-5.4.0/debian/templates/nvidia.postinst.in	2020-04-22 16:00:04.000000000 +0000
+++ linux-restricted-modules-5.4.0/debian/templates/nvidia.postinst.in	2020-04-22 21:43:55.000000000 +0000
@@ -10,16 +10,15 @@
     exit 0
 fi
 
-ubiquity_host() {
-    if [ -n "${UBIQUITY_FRONTEND}" ]; then
-        if [ -e /bin/in-target ]; then
-            return 0
-        fi
+ubiquity_live() {
+    if [ -n "${UBIQUITY_FRONTEND}" ] && ! systemd-detect-virt --chroot; then
+        return 0
+    else
+        return 1
     fi
-    return 1
 }
 # Must load the confmodule for our template to be installed correctly.
-if ! ubiquity_host; then
+if ! ubiquity_live; then
     . /usr/share/debconf/confmodule
 fi
 
@@ -34,10 +33,10 @@
 esac
 
 mkdir -p /usr/lib/linux
-if ! ubiquity_host; then
-    db_get linux/nvidia/latelink
-else
+if ubiquity_live; then
     RET=false
+else
+    db_get linux/nvidia/latelink
 fi
 # If the value is changed write it back.
 if [ "$RET" != "$latelink" ]; then