The laptop with USB modem is in another city with my elder relative. The laptop has dual boot with XP and Ubuntu. Modem works in XP. The modem did work in Ubuntu but not anymore. I cannot fix the problem remotely.
When I visit her I will fix it. After that, I need a way to backup the functionality of the modem and more importantly, an EASY way to restore it. So easy that 65 years old non-geek lady can do it with me helping over the phone.
Update: now the system works, but I still do not have a way to easily (backup and) restore the networking in a case of failure.
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