ERROR MESSAGE WHEN INSTALLING CHINESE INPUT

ERROR MESSAGE WHEN INSTALLING CHINESE INPUT

i have ubuntu 12.04 and I was trying to install the chinese input. I got
the following error messages. Help! Thank you!
Requires installation of untrusted packages
The action would require the installation of packages from not
authenticated sources.
Details: cmap-adobe-cns1 cmap-adobe-gb1 fonts-arphic-ukai
fonts-arphic-uming ibus-sunpinyin ibus-table-cangjie
ibus-table-cangjie-big ibus-table-cangjie3 ibus-table-cangjie5
ibus-table-wubi libchewing3 libchewing3-data libsunpinyin3 python-glade2
sunpinyin-data ttf-arphic-ukai ttf-wqy-zenhei