On upgrading from feisty to gutsy with a do-release-upgrade iftab was
not correctly converted.
The former mac-address in iftab was uppercase, but udev refers to lowercase and
so created a new device:
---
> cat /etc/udev/rules.d/70-persistent-net.rules
# Converted from /etc/iftab on upgrade
SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:0C:29:F1:74:5D",
NAME="eth0"
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:0c:29:f1:74:5d",
NAME="eth1"
---
>cat /etc/iftab
##eth0 mac 00:0C:29:F1:74:5D
---
This broke the network-configuration of the server.
--
iftab -> persistent rules transition can break existing setups
https://bugs.launchpad.net/bugs/125139
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