Accessing serial ports via a snap on Ubuntu classic?

ATM you will have to build your own gadget to achieve this … iirc one of @kyrofa’s blog howtos covers this specific case …

EDIT: whoops, missed the “classic” in the subject … afaik on classic there is no way at all currently and on core, creating a custom gadget is the workaround … and AFAIK “hotplug” in interfaces is the solution (i am told)