Emboss can access various biological databases automatically. However, this need to be configured. First of all type:
$ showdb
If you get line nothing in the list of databases, this document is for you. First we locate the emboss.default.template file.
$ locate emboss.default.template
Then cd to that directory and create copy.
$ cp emboss.default.template emboss.default
Open emboss.default and uncomment the databases you desire by deleting # symbol at the beginning of the concerned lines.
$ showdb
You should see your databases now.