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I have tried to upgrade from 16.04 to 18.04. But i'm facing some problems.

nuc ➜  ~  sudo apt update                              

Hit:1 http://se.archive.ubuntu.com/ubuntu bionic InRelease

Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88,7 kB]

Hit:3 http://se.archive.ubuntu.com/ubuntu bionic-updates InRelease                   

Hit:4 http://se.archive.ubuntu.com/ubuntu bionic-backports InRelease                 

Fetched 88,7 kB in 0s (164 kB/s)                               

Reading package lists... Done

Building dependency tree       

Reading state information... Done

1919 packages can be upgraded. Run 'apt list --upgradable' to see them.

nuc ➜  ~  sudo apt upgrade

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Calculating upgrade... 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:

 python3-aptdaemon.pkcompat : Conflicts: packagekit

                              Conflicts: packagekit:i386

E: Broken packages

I have tried to remove the conflicting packages:

nuc ➜  ~  sudo apt remove packagekit packagekit:i386

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Package 'packagekit' is not installed, so not removed

Package 'packagekit:i386' is not installed, so not removed

The following packages were automatically installed and are no longer required:

  amd64-microcode thermald

Use 'sudo apt autoremove' to remove them.

0 upgraded, 0 newly installed, 0 to remove and 1919 not upgraded.

1 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Setting up linux-image-unsigned-4.15.0-45-generic (4.15.0-45.48) ...

Processing triggers for linux-image-unsigned-4.15.0-45-generic (4.15.0-45.48) ...

/etc/kernel/postinst.d/initramfs-tools:

update-initramfs: Generating /boot/initrd.img-4.15.0-45-generic

cp: failed to restore the default file creation context: Invalid argument

W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915

W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915

cp: failed to restore the default file creation context: Invalid argument

E: /usr/share/initramfs-tools/hooks/kmod failed with return 1.

update-initramfs: failed for /boot/initrd.img-4.15.0-45-generic with 1.

run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

dpkg: error processing package linux-image-unsigned-4.15.0-45-generic (--configure):

 subprocess installed post-installation script returned error exit status 1

Errors were encountered while processing:

 linux-image-unsigned-4.15.0-45-generic

E: Sub-process /usr/bin/dpkg returned an error code (1)

Any advice would be helpfull!

Make sure that your important files and file system are backed up before doing a distro update. I recommend using rsync for any type of file system backups. Have you tried

sudo apt clean

sudo apt-get update

sudo apt-get upgrade

sudo apt-get dist-upgrade