_ [debian] woody → sid

woody から sid に dist-upgrade しようとしたら、

W: You may want to run apt-get update to correct these problems
E: This installation run will require temporarily removing the
 essential package e2fsprogs due to a Conflicts/Pre-Depends loop.
 This is often bad, but if you really want to do it, activate
 the APT::Force-LoopBreak option.
E: Internal Error, Could not early remove e2fsprogs

となったので、

apt-get -o APT::Force-LoopBreak=yes install e2fsprogs

で突破。