Configuration lost during upgrade

[nicklogan]

During an update/upgrade cycle I may have accidentally answered "yes" to a
question about changing the default configuration files and can no longer
connect to any PC via usb. Attempts to do so get the following:

~$ sudo ifconfig usb0 192.168.0.200 netmask 255.255.255.248
 
SIOCSIFADDR: No such device
usb0: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device

No files in either PC I connected to previously have changed.

How can I restore the connection and/or the original configuration files?
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