Button instead of link to "Create Persistent Storage" from Additional Software

I put a button instead of a link on this wireframe on purpose: while “Synaptic” and “APT on the command line” sound like recommendations and shortcuts to me, the pointer to creating a persistent storage sounds more like a recommended action and deserves a button instead of a link.

It’s no big deal but maybe you agree with me and if it’s easy to fix :)

Parent Task: #14594 (closed)

Original created by @sajolida on 15529 (Redmine)