before sudo apt-get install gnuplot

I sudo apt-get build-dep gnuplot to resolve package dependencies.

~$ sudo apt-get build-dep gnuplot

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Note, selecting 'liblua5.1-0-dev' instead of 'liblua5.1-dev'

The following packages will be REMOVED:

  libgd2-xpm ubuntu-desktop

The following NEW packages will be installed:

  debhelper diffstat html2text intltool-debian libbsd-dev

  libcairo-script-interpreter2 libcairo2-dev libedit-dev libexpat1-dev

  libfontconfig1-dev libfreetype6-dev libgd2-noxpm libgd2-noxpm-dev

  libglib2.0-dev libjpeg62-dev liblua5.1-0-dev libncurses5-dev libpango1.0-dev

  libpixman-1-dev libpng12-dev libreadline-dev libreadline6-dev libtinfo-dev

  libwxbase2.8-dev libwxgtk2.8-dev libxcb-render0-dev libxcb-shm0-dev

  libxft-dev libxrender-dev po-debconf quilt texinfo wx2.8-headers

  x11proto-render-dev

0 upgraded, 34 newly installed, 2 to remove and 0 not upgraded.

Need to get 9,100 kB of archives.

After this operation, 37.8 MB of additional disk space will be used.

It says the "ubuntu-desktop" will be removed,

but "ubuntu-desktop" is important.

What's should I do?