Hi,
have a look at
https://bugs.launchpad.net/ubuntu/+source/netbase/+bug/102675
This bug is certainly a duplicate of this bug. But you are lucky, the
solution have been found !
Regards,
Olivier
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Boot proces takes a very long time during network configuration
*** This bug is a duplicate of bug 102675 ***
https://bugs.launchpad.net/bugs/102675
** This bug has been marked a duplicate of bug 102675
Feisty boot hangs on Configuring network interfaces
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Boot proces takes a very long time during network configuration