dhclient invoked with wrong leases path, because dhclient3 exists as symlink

[Daniel Hahler]

I am getting the following error in syslog:
  dhclient: can't create /var/lib/dhcp3/dhclient.eth0.leases: No such file or directory

ifupdown (invoked by ifup) appears to use a wrong leases path:
  dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp3/dhclient.eth0.leases eth0

From looking at the ifupdown package, it appears to come from ifupdown.nw:
  up
      [[ifconfig %iface% hw %hwaddress%]]
      dhclient3 [[-e IF_METRIC=%metric%]] -pf /var/run/dhclient.%iface%.pid -lf /var/lib/dhcp3/dhclient.%iface%.leases %iface% \
          if (execable("/sbin/dhclient3"))
      dhclient [[-e IF_METRIC=%metric%]] -v -pf /var/run/dhclient.%iface%.pid -lf /var/lib/dhcp/dhclient.%iface%.leases %iface% \
          elsif (execable("/sbin/dhclient"))

% ll /sbin/dhclient*
-rwxr-xr-x 1 root root 495K 2011-08-11 17:50 /sbin/dhclient*
lrwxrwxrwx 1 root root 8 2011-08-15 19:11 /sbin/dhclient3 -> dhclient*

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: ifupdown 0.6.10ubuntu4
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic-pae 3.0.4
Uname: Linux 3.0.0-10-generic-pae i686
Architecture: i386
Date: Sun Sep 4 14:07:10 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
SourcePackage: ifupdown
UpgradeStatus: No upgrade log present (probably fresh install)

[Kenyon Ralph (kralph)]

Seems to me that the solution is to remove the /sbin/dhclient3 -> /sbin/dhclient symlink. This is what I have done to fix this bug on my natty system. I see no reason to have a dhclient3 symlink when you're not actually running version 3. So perhaps this bug should be reassigned to the isc-dhcp-client package, but then it would be a duplicate of Bug #768171.