Hacking an old version of Electrum, I can generate the seed
$ python mnemonic.py witch collapse practice feed shame open despair creek road again ice least
25a39767960aafbdba67ad41f5657826
But then this isn't recognized by libbitcoin
$ bx ec-to-public 25a39767960aafbdba67ad41f5657826
Error: the argument ('25a39767960aafbdba67ad41f5657826') for option '--EC_PRIVATE_KEY' is invalid