SOLUTION HERE: https://forum.ubuntu-fr.org/viewtopic.php?pid=21300621#p21300621 - it's in French but if you follow the commands you should be golden. Start at "Voici donc le nettoyage que je propose avec mes commandes magiques."
I have managed to upgrade to Ubuntu 16.04 a couple of months ago. It hit me with some errors during the installation but I was able to fix them using this forum. Now, however, I keep seeing the "low /boot space" message. I have tried all of the solutions proposed for this question: Not enough free disk space when upgrading and this one How do I remove old kernel versions to clean up the boot menu? and to no avail. I know for a fact that I have /boot on a different partition and that I have old kernels installed. Problem is, they will not be deleted:
masters@masters-Aspire-V3-772G:~$ dpkg -l |grep linux-image
linux-image-3.13.0-74-generic 3.13.0-74.118 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-3.13.0-86-generic 3.13.0-86.131 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-3.13.0-88-generic 3.13.0-88.135 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-3.13.0-93-generic 3.13.0-93.140 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
linux-image-4.4.0-34-generic 4.4.0-34.53 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-36-generic 4.4.0-36.55 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-4.4.0-38-generic 4.4.0-38.57 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
linux-image-extra-3.13.0-74-generic 3.13.0-74.118 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
linux-image-extra-3.13.0-86-generic 3.13.0-86.131 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
linux-image-extra-3.13.0-88-generic 3.13.0-88.135 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
linux-image-extra-3.13.0-93-generic 3.13.0-93.140 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
linux-image-extra-4.4.0-34-generic 4.4.0-34.53 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP
linux-image-extra-4.4.0-36-generic 4.4.0-36.55 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP
linux-image-extra-4.4.0-38-generic 4.4.0-38.57 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP
linux-image-extra-4.4.0-42-generic 4.4.0-42.62 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP
linux-image-generic 4.4.0.42.44 amd64 Generic Linux kernel image
masters@masters-Aspire-V3-772G:~$ sudo apt-get purge linux-image-extra-3.13.0-93-generic
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
linux-image-extra-4.4.0-42-generic : Depends: linux-image-4.4.0-42-generic but it is not going to be installed
linux-image-generic : Depends: linux-image-4.4.0-42-generic but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
Apparently, these packages have unmet dependencies:
The following packages have unmet dependencies:
linux-image-extra-3.13.0-74-generic : Depends: linux-image-3.13.0-74-generic but it is not going to be installed
linux-image-extra-3.13.0-86-generic : Depends: linux-image-3.13.0-86-generic but it is not going to be installed
linux-image-extra-3.13.0-88-generic : Depends: linux-image-3.13.0-88-generic but it is not going to be installed
linux-image-extra-3.13.0-93-generic : Depends: linux-image-3.13.0-93-generic but it is not going to be installed
linux-image-extra-4.4.0-34-generic : Depends: linux-image-4.4.0-34-generic but it is not going to be installed
linux-image-extra-4.4.0-42-generic : Depends: linux-image-4.4.0-42-generic but it is not going to be installed
linux-image-generic : Depends: linux-image-4.4.0-42-generic but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
After much roaming, I found someone who posted this command for unmet dependencies:
dpkg --list | grep 'linux-headers' | awk '{ print $2 }' | sort -V | sed -n '/'"$(uname -r | sed "s/\([0-9.-]*\)-\([^0-9]\+\)/\1/")"'/q;p' | xargs sudo dpkg -P
but my output is of this following type:
dpkg: error processing package linux-image-3.13.0-93-generic (--purge):
dependency problems - not removing
dpkg: dependency problems prevent removal of linux-image-4.4.0-34-generic:
linux-image-extra-4.4.0-34-generic depends on linux-image-4.4.0-34-generic.
I was suggested to try this:
sudo apt-get remove -f linux-image-extra-3.13.0-74-generic ... linux-image-extra-3.13.0-93-generic
but terminal returns:
masters@masters-Aspire-V3-772G:~$ sudo apt-get remove -f linux-image-3.13.0-74-generic, linux-image-3.13.0-86-generic, linux-image-3.13.0-88-generic,linux-image-3.13.0-93-generic
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-image-3.13.0-74-generic,
E: Couldn't find any package by glob 'linux-image-3.13.0-74-generic,'
E: Couldn't find any package by regex 'linux-image-3.13.0-74-generic,'
E: Unable to locate package linux-image-3.13.0-86-generic,
E: Couldn't find any package by glob 'linux-image-3.13.0-86-generic,'
E: Couldn't find any package by regex 'linux-image-3.13.0-86-generic,'
E: Unable to locate package linux-image-3.13.0-88-generic,linux-image-3.13.0-93-generic
E: Couldn't find any package by glob 'linux-image-3.13.0-88-generic,linux-image-3.13.0-93-generic'
E: Couldn't find any package by regex 'linux-image-3.13.0-88-generic,linux-image-3.13.0-93-generic'
I'd appreciate it if anyone could help me figure this out.
Thanks a bunch.
--force-yesoption, that issudo apt-get --force-yes purge linux-image-3.13.0-74-generic. It's also a good idea to revise the question, and make it very clear that the /boot space problem is secondary, and is only mention as an introduction. – mikewhatever Oct 14 '16 at 13:42