This has nothing to do with ifupdown as the ifconfig command isn't even
in the ifupdown package.
My guess is that you're trying to change your mac address before first
bringing your interface down.
ifconfig eth0 down
ifconfig eth0 hw addr 00:11:22:33:44:55
ifconfig eth0 up
should work just fine.
** Changed in: ifupdown (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/424002
Title:
strange ifup behaviour on MAC changing
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