OK. The first problem is that you first need to initialize x48 for the ROM you want.

$ x48 -initialize -rom gxrom-r

The second is that the font it needs doesn't exist. Probably xlsfonts does not exist for the N9, so just try with "fixed":

$ x48 -initialize -smallFont fixed -verbose -rom gxrom-r
(-verbose so that you can hopefully see what's going on).