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I am unable to upgrade from Ubuntu 16.04.5 LTS to 18.04.1 LTS because one package has not been upgraded (libbluray-bdj). When I try to upgrade it, it can't be upgraded because it depends on a package (libasm-java) that is not upgradable because it has no installation candidate. When I try to remove libbluray-bdj, it tells me it will remove ubuntu-mate-desktop which I don't want to do.

I was performing the upgrade via the terminal because I did a partial upgrade through Software Updater previously (before I ran into these problems), and I don't want to leave my system in a partial uprade state between 16.04.5 and 18.04.1.

I just want to upgrade to 18.04.1. Thanks!

Here are the commands I used and their outputs:

lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 16.04.5 LTS

Release: 16.04

Codename: xenial

sudo apt update && sudo apt upgrade

1 package can be upgraded. Run 'apt list --upgradable' to see it.

apt list --upgradable -a

libbluray-bdj/xenial,xenial 1:1.0.2-3~xenial all [upgradable from: 1:0.9.2-2]

N: There is 1 additional version. Please use the '-a' switch to see it

sudo apt-get dist-upgrade

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

sudo apt-get upgrade -y

The following packages have been kept back:

libbluray-bdj

0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

sudo do-release-upgrade

Please install all available updates for your release before upgrading.

sudo apt-get dist-upgrade libbluray-bdj

Reading package lists... Done

Building dependency tree

Reading state information... Done

Calculating upgrade... Error!

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:

libbluray-bdj : Depends: libasm-java but it is not installable

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

sudo apt-get dist-upgrade libasm-java

Reading package lists... Done

Building dependency tree

Reading state information... Done

Package libasm-java is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libasm-java' has no installation candidate

 sudo apt-get remove libbluray-bdj

The following packages will be REMOVED:

libbluray-bdj ubuntu-mate-desktop

and I don't want to remove ubuntu-mate-desktop.

UPDATE:

Here are the contents of /etc/apt/sources.list:

$ cat /etc/apt/sources.list  

# deb cdrom:[Ubuntu-MATE 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215)]/ xenial main multiverse restricted universe



# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to

# newer versions of the distribution.

deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted



## Major bug fix updates produced after the final release of the

## distribution.

deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.

deb http://us.archive.ubuntu.com/ubuntu/ xenial universe

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial universe

deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 

## team, and may not be under a free licence. Please satisfy yourself as to 

## your rights to use the software. Also, please note that software in 

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.

deb http://us.archive.ubuntu.com/ubuntu/ xenial multiverse

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial multiverse

deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse



## N.B. software from this repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.

deb http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse



## Uncomment the following two lines to add software from Canonical's

## 'partner' repository.

## This software is not part of Ubuntu, but is offered by Canonical and the

## respective vendors as a service to Ubuntu users.

deb http://archive.canonical.com/ubuntu xenial partner

# deb-src http://archive.canonical.com/ubuntu xenial partner



deb http://security.ubuntu.com/ubuntu xenial-security main restricted

# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted

deb http://security.ubuntu.com/ubuntu xenial-security universe

# deb-src http://security.ubuntu.com/ubuntu xenial-security universe

deb http://security.ubuntu.com/ubuntu xenial-security multiverse

# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse