There has to be a slight difference somewhere in the two systems. Are
they at the same kernel version? You can find out by looking at the
output of 'uname -a" and comparing the two (the result of "dpkg -l
linux-image" is also quite useful). I'm guessing the devices are not the
same brand and model, and probably load a different driver that would
have differences between the two machines, but that's just guessing.
To be best able to understand what is going on, you could attach the
contents of /var/log/syslog after reproducing the failure with the bad
device, and testing a device that works, maybe we can find a difference
in how they get recognized by the system.
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/728016
Title:
network connections all die when other ethernet device is plugged in
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