The following packages will be REMOVED:  
  php5-gd{p} 
0 packages upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 148 kB will be freed.
The following packages have unmet dependencies:
 roundcube-core : Depends: php5-gd but it is not going to be installed.
The following actions will resolve these dependencies:

     Remove the following packages:              
1)     roundcube                                 
2)     roundcube-core                            
3)     roundcube-plugins                         

     Leave the following dependencies unresolved:
4)     phpmyadmin recommends php5-gd