lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" dpkg --configure -a
lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" apt-get install -fy
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  cairo-dock-core cairo-dock-data cairo-dock-plug-ins cairo-dock-plug-ins-data
  cairo-dock-plug-ins-dbus-interface-python cairo-dock-plug-ins-integration
  libetpan17 libfuse2:i386 libgldi3 libgnome-menu-3-0 libido3-0.1-0
  libzeitgeist-2.0-0 mokutil shim
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 307 not upgraded.
lubuntu@lubuntu:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" apt-get install -y --force-yes dmraid
Reading package lists... Done
Building dependency tree
Reading state information... Done
dmraid is already the newest version (1.0.0.rc16-4.2ubuntu3).
The following packages were automatically installed and are no longer required:
  cairo-dock-core cairo-dock-data cairo-dock-plug-ins cairo-dock-plug-ins-data
  cairo-dock-plug-ins-dbus-interface-python cairo-dock-plug-ins-integration
  libetpan17 libfuse2:i386 libgldi3 libgnome-menu-3-0 libido3-0.1-0
  libzeitgeist-2.0-0 mokutil shim
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 307 not upgraded.
lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" dmraid -ay
no raid disks
lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" apt-get install -y --force-yes lvm2
Reading package lists... Done
Building dependency tree
Reading state information... Done
lvm2 is already the newest version (2.02.133-1ubuntu10).
The following packages were automatically installed and are no longer required:
  cairo-dock-core cairo-dock-data cairo-dock-plug-ins cairo-dock-plug-ins-data
  cairo-dock-plug-ins-dbus-interface-python cairo-dock-plug-ins-integration
  libetpan17 libfuse2:i386 libgldi3 libgnome-menu-3-0 libido3-0.1-0
  libzeitgeist-2.0-0 mokutil shim
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 307 not upgraded.
lubuntu@lubuntu:~$ sudo chroot "/mnt/boot-sav/mapper/mint--vg-root" apt-get install -y --force-yes grub-efi-amd64-signed shim-signed linux-signed-generic
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 linux-signed-generic : Depends: linux-headers-generic (= 4.4.0.77.83) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
lubuntu@lubuntu:~$