diff -pruN 14.0.0~pre2/debian/changelog 14.0.0~pre2ubuntu1/debian/changelog
--- 14.0.0~pre2/debian/changelog	2025-08-17 21:33:02.000000000 +0000
+++ 14.0.0~pre2ubuntu1/debian/changelog	2025-10-22 04:35:45.000000000 +0000
@@ -1,3 +1,10 @@
+desktop-base (14.0.0~pre2ubuntu1) resolute; urgency=medium
+
+  * Merge from Debian Unstable. Remaining changes:
+    - debian/postinst, debian/prerm: Don't apply Debian branding for GRUB
+
+ -- Rik Mills <rikmills@kde.org>  Wed, 22 Oct 2025 05:35:45 +0100
+
 desktop-base (14.0.0~pre2) unstable; urgency=medium
 
   [ Simon McVittie ]
@@ -20,6 +27,13 @@ desktop-base (14.0.0~pre1) unstable; urg
 
  -- Aurélien COUDERC <coucouf@debian.org>  Mon, 11 Aug 2025 12:29:08 +0200
 
+desktop-base (13.0.3ubuntu1) questing; urgency=medium
+
+  * Merge from Debian Unstable. Remaining changes:
+    - debian/postinst, debian/prerm: Don't apply Debian branding for GRUB
+
+ -- Rik Mills <rikmills@kde.org>  Sat, 31 May 2025 10:36:43 +0100
+
 desktop-base (13.0.3) unstable; urgency=medium
 
   * Fix incongruous black background in logo-text.svg and
@@ -36,6 +50,13 @@ desktop-base (13.0.3) unstable; urgency=
 
  -- Aurélien COUDERC <coucouf@debian.org>  Fri, 30 May 2025 14:30:31 +0200
 
+desktop-base (13.0.2ubuntu1) questing; urgency=medium
+
+  * Merge from Debian Unstable. Remaining changes:
+    - debian/postinst, debian/prerm: Don't apply Debian branding for GRUB
+
+ -- Rik Mills <rikmills@kde.org>  Thu, 22 May 2025 15:52:39 +0100
+
 desktop-base (13.0.2) unstable; urgency=medium
 
   * Use new version of logo-text.svg that renders in rsvg
@@ -56,6 +77,13 @@ desktop-base (13.0.1) unstable; urgency=
 
  -- Jonathan Carter <jcc@debian.org>  Tue, 06 May 2025 16:03:29 +0200
 
+desktop-base (13.0.0~pre1ubuntu1) plucky; urgency=medium
+
+  * Merge from Debian Unstable. Remaining changes:
+    - debian/postinst, debian/prerm: Don't apply Debian branding for GRUB
+
+ -- Simon Quigley <tsimonq2@ubuntu.com>  Thu, 21 Nov 2024 16:31:47 -0600
+
 desktop-base (13.0.0~pre1) unstable; urgency=medium
 
   [ Simon McVittie ]
diff -pruN 14.0.0~pre2/debian/control 14.0.0~pre2ubuntu1/debian/control
--- 14.0.0~pre2/debian/control	2025-05-23 09:26:01.000000000 +0000
+++ 14.0.0~pre2ubuntu1/debian/control	2025-05-31 09:36:43.000000000 +0000
@@ -1,7 +1,8 @@
 Source: desktop-base
 Section: x11
 Priority: optional
-Maintainer: Debian Desktop Team <debian-desktop@lists.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Desktop Team <debian-desktop@lists.debian.org>
 Uploaders: Yves-Alexis Perez <corsac@debian.org>,
            Aurélien COUDERC <coucouf@debian.org>,
            Jonathan Carter <jcc@debian.org>
diff -pruN 14.0.0~pre2/debian/postinst 14.0.0~pre2ubuntu1/debian/postinst
--- 14.0.0~pre2/debian/postinst	2025-05-23 09:26:01.000000000 +0000
+++ 14.0.0~pre2ubuntu1/debian/postinst	2025-05-22 14:49:40.000000000 +0000
@@ -239,80 +239,26 @@ EOF
     # Favor widescreen / hi-res background for efi installations detected
     # by the presence of grub-efi* packages (not the grub-efi*-bin which don’t
     # necessary account for grub being the active bootloader).
-    if dpkg-query --list grub-efi* | grep -v "^... grub-efi[^[:space:]]*-bin" | grep -q "^[ih][HUFWti] " ; then
-        echo "grub-efi* packages found, using 16/9 as default grub background ratio"
-        grub_first_ratio="16x9"
-        grub_second_ratio="4x3"
-    else
-        echo "No grub-efi* package found, using 4/3 as default grub background ratio"
-        grub_first_ratio="4x3"
-        grub_second_ratio="16x9"
-    fi
-    active_grub_background=/usr/share/desktop-base/active-theme/grub/grub_background.sh
-    active_grub_first_ratio=/usr/share/desktop-base/active-theme/grub/grub-${grub_first_ratio}.png
-    if [ -e ${active_grub_first_ratio} ] && [ -e ${active_grub_background} ]; then
-        update-alternatives --install \
-            /usr/share/images/desktop-base/desktop-grub.png \
-            desktop-grub ${active_grub_first_ratio} 50 \
-            --slave /usr/share/desktop-base/grub_background.sh \
-            desktop-grub.sh ${active_grub_background}
-    fi
-    active_grub_second_ratio=/usr/share/desktop-base/active-theme/grub/grub-${grub_second_ratio}.png
-    if [ -e ${active_grub_second_ratio} ] && [ -e ${active_grub_background} ]; then
-        update-alternatives --install \
-            /usr/share/images/desktop-base/desktop-grub.png \
-            desktop-grub ${active_grub_second_ratio} 45 \
-            --slave /usr/share/desktop-base/grub_background.sh \
-            desktop-grub.sh ${active_grub_background}
-    fi
-    # Alternatives for theme packages
-    while read theme ratio priority; do
-        update-alternatives --install /usr/share/images/desktop-base/desktop-grub.png \
-            desktop-grub \
-            /usr/share/desktop-base/$theme-theme/grub/grub-$ratio.png $priority \
-            --slave /usr/share/desktop-base/grub_background.sh \
-            desktop-grub.sh \
-            /usr/share/desktop-base/$theme-theme/grub/grub_background.sh
-    done << EOF
-ceratopsian 4x3 40
-ceratopsian 16x9 40
-emerald 4x3 30
-emerald 16x9 30
-homeworld 4x3 30 
-homeworld 16x9 30
-futureprototype 4x3 30
-futureprototype 16x9 30
-moonlight 4x3 30
-moonlight 16x9 30
-softwaves 4x3 30
-softwaves 16x9 30
-lines 4x3 30
-lines 16x9 30
-joy 4x3 30
-joy 16x9 30
-spacefun 4x3 30
-spacefun 16x9 30
-EOF
 
     # Apply GRUB background update into /boot
     # Try detecting active grub packages (so not -doc, -common, -bin) as a hint
     # that GRUB is being used as bootloader before calling update-grub.
     # Some people use the *-bin packages without using GRUB as bootloader
     # (see #851893 for more context).
-    if dpkg-query --list "grub-*" | grep -v "^... grub\(-common\|-emu\|[^[:space:]]*\(-bin\|-doc\)\)" | grep -q "^[ih][HUFWti] " \
-            && which update-grub > /dev/null ; then
+#    if dpkg-query --list "grub-*" | grep -v "^... grub\(-common\|-emu\|[^[:space:]]*\(-bin\|-doc\)\)" | grep -q "^[ih][HUFWti] " \
+#            && which update-grub > /dev/null ; then
         # Ensure the background image file has actually been written to disc
         # before updating.
-        sync
+#        sync
         # Report success whatever grub return status. This is needed at least
         # in live systems fon installation to succeed (see #850601).
         # Until we find a better solution like detecting we’re in a live image
         # and not calling update-grub at all.
-        update-grub || echo "Updating grub failed, report success anyway!"
-    fi
+#        update-grub || echo "Updating grub failed, report success anyway!"
+#    fi
 
-    if which update-initramfs > /dev/null; then
-        update-initramfs -u
-    fi
+#    if which update-initramfs > /dev/null; then
+#        update-initramfs -u
+#    fi
 
 fi
diff -pruN 14.0.0~pre2/debian/prerm 14.0.0~pre2ubuntu1/debian/prerm
--- 14.0.0~pre2/debian/prerm	2025-05-23 09:26:01.000000000 +0000
+++ 14.0.0~pre2ubuntu1/debian/prerm	2025-05-22 14:47:46.000000000 +0000
@@ -145,51 +145,6 @@ EOF
         desktop-login-background \
         /usr/share/desktop-base/active-theme/login/background.svg
 
-    # Remove GRUB background alternatives
-    while read theme ratio; do
-        update-alternatives --remove \
-            desktop-grub \
-            /usr/share/desktop-base/$theme-theme/grub/grub-$ratio.png
-    done << EOF
-ceratopsian 4x3
-ceratopsian 16x9
-emerald 4x3
-emerald 16x9
-homeworld 4x3
-homeworld 16x9
-futureprototype 4x3
-futureprototype 16x9
-moonlight 4x3
-moonlight 16x9
-softwaves 4x3
-softwaves 16x9
-lines 4x3
-lines 16x9
-joy 4x3
-joy 16x9
-spacefun 4x3
-spacefun 16x9
-EOF
-    ## *Lastly* remove *highest priority* alternative
-    num_grub_efi_installed=$(dpkg-query --list "grub-efi*" 2> /dev/null | grep "^i" | wc -l)
-    if [ $num_grub_efi_installed -gt 0 ] ; then
-        remove_first_ratio=4x3
-        remove_last_ratio=16x9
-    else
-        remove_first_ratio=16x9
-        remove_last_ratio=4x3
-    fi
-    update-alternatives --remove \
-        desktop-grub.sh \
-        /usr/share/desktop-base/active-theme/grub/grub_background.sh
-    update-alternatives --remove \
-        desktop-grub \
-        /usr/share/desktop-base/active-theme/grub/grub-$remove_first_ratio.png
-    update-alternatives --remove \
-        desktop-grub \
-        /usr/share/desktop-base/active-theme/grub/grub-$remove_last_ratio.png
-
-
     # Remove theme package alternatives
     while read theme; do
         update-alternatives --remove \
