the best app for podcats in ubuntu that i found was gpodder It has a sync to device that suports IPOD, and also you can upload your subscriptions to the online account to keep your list synced across computers
Synchronize podcasts with Rhythmbox to an iPod
the best app for podcats in ubuntu that i found was gpodder It has a sync to device that suports IPOD, and also you can upload your subscriptions to the online account to keep your list synced across computers