Please try installing ubuntu-mate-core and then upgrading, from

2018-02-19 10:28:35,869 DEBUG none of the '['ubuntu-desktop', 
'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop', 
'ubuntu-gnome-desktop', 'ubuntu-mate-core', 'ubuntu-mate-cloudtop', 
'ubuntu-mate-desktop', 'ubuntukylin-desktop']' meta-pkgs installed
2018-02-19 10:28:35,877 DEBUG guessing 'ubuntu-mate-core' as missing meta-pkg
2018-02-19 10:28:37,063 ERROR failed to mark 'ubuntu-mate-core' for install 
(E:Unable to correct problems, you have held broken packages.)

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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  cant upgrade

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