The -desktop packages are meta-packages which pull in the applications and packages needed for that environment. If both Ubuntu-desktop and and other -desktop package are installed at the same time, when you upgrade to the next release, the upgrade will fail and you will be facing difficulties of a partial upgrade to the next release.
The -desktop packages are meta-packages which pull in the applications and packages needed for that environment. If both Ubuntu-desktop and and other -desktop package are installed at the same time, when you upgrade to the next release, the upgrade will fail and you will be facing difficulties of a partial upgrade to the next release.