mlterm depende do mlterm-common :
The following NEW packages will be installed:
mlterm mlterm-common
0 upgraded, 2 newly installed, 0 to remove and 5 not upgraded.
Need to get 1,619 kB of archives.
After this operation, 8,664 kB of additional disk space will be used.
, que é de 1,4 M bytes. Você baixou (e instalou) dois pacotes, não um.