sudo apt install gksu
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libgksu2-0
The following NEW packages will be installed:
  gksu libgksu2-0
0 upgraded, 2 newly installed, 0 to remove and 3 not upgraded.
4 not fully installed or removed.
Need to get 99.6 kB of archives.
After this operation, 740 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  libgksu2-0 gksu
Install these packages without verification? [y/N] y
Get:1 http://in.archive.ubuntu.com/ubuntu/ trusty/universe libgksu2-0 amd64 2.0.13~pre1-6ubuntu4 [71.8 kB]
Get:2 http://in.archive.ubuntu.com/ubuntu/ trusty/universe gksu amd64 2.0.2-6ubuntu2 [27.8 kB]
Fetched 99.6 kB in 1s (86.9 kB/s)
Selecting previously unselected package libgksu2-0.
(Reading database ... 412467 files and directories currently installed.)
Preparing to unpack .../libgksu2-0_2.0.13~pre1-6ubuntu4_amd64.deb ...
Unpacking libgksu2-0 (2.0.13~pre1-6ubuntu4) ...
Selecting previously unselected package gksu.
Preparing to unpack .../gksu_2.0.2-6ubuntu2_amd64.deb ...
Unpacking gksu (2.0.2-6ubuntu2) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for gconf2 (3.2.6-0ubuntu2) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support (3.54ubuntu1.1) ...
Setting up linux-image-4.4.0-75-generic (4.4.0-75.96~14.04.1) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
The link /initrd.img is a dangling linkto /boot/initrd.img-4.4.0-75-generic
vmlinuz(/boot/vmlinuz-4.4.0-75-generic
) points to /boot/vmlinuz-4.4.0-75-generic
 (/boot/vmlinuz-4.4.0-75-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.4.0-75-generic.postinst line 491.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-75-generic /boot/vmlinuz-4.4.0-75-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-75-generic /boot/vmlinuz-4.4.0-75-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-75-generic

gzip: stdout: No space left on device
E: mkinitramfs failure cpio 141 gzip 1
update-initramfs: failed for /boot/initrd.img-4.4.0-75-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.4.0-75-generic.postinst line 1052.
dpkg: error processing package linux-image-4.4.0-75-generic (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of linux-image-extra-4.4.0-75-generic:
 linux-image-extra-4.4.0-75-generic depends on linux-image-4.4.0-75-generic; however:
  Package linux-image-4.4.0-75-generic is not configured yet.

dpkg: error processing package linux-image-extra-4.4.0-75-generic (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-image-generic-lts-xenial:
 linux-image-generic-lts-xenial depends on linux-image-4.4.0-75-generic; however:
  Package linux-image-4.4.0-75-generic is not configured yet.
 linux-image-generic-lts-xenial depends on linux-image-extra-4.4.0-75-generic; however:
  Package linux-image-extra-4.4.0-75-generic is not configured yet.

dpkg: error processing package linux-image-generic-lts-xenial (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-generic-lts-xenial:
 linux-generic-lts-xenial depends on linux-image-generic-lts-xeniaNo apport report written because the error message indicates its a followup error from a previous failure.
                             No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                                                       No apport report written because MaxReports is reached already
                                                      l (= 4.4.0.75.62); however:
  Package linux-image-generic-lts-xenial is not configured yet.

dpkg: error processing package linux-generic-lts-xenial (--configure):
 dependency problems - leaving unconfigured
Setting up libgksu2-0 (2.0.13~pre1-6ubuntu4) ...
update-alternatives: using /usr/share/libgksu/debian/gconf-defaults.libgksu-sudo to provide /usr/share/gconf/defaults/10_libgksu (libgksu-gconf-defaults) in auto mode
Processing triggers for gconf2 (3.2.6-0ubuntu2) ...
Setting up gksu (2.0.2-6ubuntu2) ...
Processing triggers for libc-bin (2.19-0ubuntu6.11) ...
Errors were encountered while processing:
 linux-image-4.4.0-75-generic
 linux-image-extra-4.4.0-75-generic
 linux-image-generic-lts-xenial
 linux-generic-lts-xenial
E: Sub-process /usr/bin/dpkg returned an error code (1)
arya@arya-theStarks:~$