Installing this font through the Ubuntu Software Center, fonts-mplus 049-1, and running Abiword, abiword 2.9.2+svn20120603-8, I can confirm that only four styles are shown by Abiword, in comparison I loaded leafpad and all the different styles were shown. Font Manager is not installed on this system suggesting that the issue does lie with Abiword.
Confirming
Installing this font through the Ubuntu Software Center, fonts-mplus 049-1, and running Abiword, abiword 2.9.2+svn201206 03-8, I can confirm that only four styles are shown by Abiword, in comparison I loaded leafpad and all the different styles were shown. Font Manager is not installed on this system suggesting that the issue does lie with Abiword.
Xubuntu 12.10