On my xen vm I tried to upgrade to wheezy, this is not possible if the host dom0 is still on etch. The kernel you are actually running is supplied by dom0 (why?) so you will now have a broken system. In particular ldconfig will segfault with kernel too old. apt-get install -f fails with:
The following packages have unmet dependencies:
cpp : Depends: cpp-4.7 (>= 4.7.2-1~) but it is not installable
g++-4.4 : Depends: gcc-4.4 (= 4.4.5-8) but 4.4.7-2 is to be installed
gcc : Depends: gcc-4.7 (>= 4.7.2-1~) but it is not installable
gcc-4.4 : Depends: gcc-4.4-base (= 4.4.7-2) but 4.4.5-8 is to be installed
Depends: cpp-4.4 (= 4.4.7-2) but 4.4.5-8 is to be installed
Depends: libgomp1 (>= 4.4.7-2) but it is not going to be installed
Recommends: libc6-dev (>= 2.13-5) but 2.11.3-4 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
Part way home it failed with:
libgcc1 : Breaks: gcc-4.4 (< 4.4.6-4) but 4.4.5-8 is to be installed
libstdc++6 : Breaks: gcc-4.4 (< 4.4.6-4) but 4.4.5-8 is to be installed
and similar.
To return to a clean squeeze install is not easy. First edit /etc/apt/sources back to squeeze.
Now edit all of the following to comment out ldconfig:/var/lib/dpkg/info/libstdc++6.postinst /var/lib/dpkg/info/libstdc++6.postrm /var/lib/dpkg/info/libgcc1.postrm /var/lib/dpkg/info/libgcc1.postinst
# Automatically added by dh_makeshlibs
#if [ "$1" = "configure" ]; then
# ldconfig
#fi
Edit /etc/apt/apt-conf
APT::Default-Release "squeeze";
Now pin the packages which have been incompatibly upgraded (note Package: * does not work:
Package: libc-bin libc6-dev locales gcc gcc-4.4 cpp libgomp1 libgcc1 libstdc++6\
build-essential
Pin: release n=wheezy
Pin-Priority: -10
Package: libc-bin libc6-dev locales gcc gcc-4.4 cpp libgomp1 libgcc1 libstdc++6\
build-essential
Pin: release n=squeeze
Pin-Priority: 900
Clear apt's cache
apt-get clean
Finally you can
apt-get install -f
And uncomment the ldconfig lines and use * in /etc/apt/preferences
Package: *
Pin: release n=wheezy
Pin-Priority: -10
Package: *
Pin: release n=squeeze
Pin-Priority: 900
Now we are back to a system where apt-get works, but sadly still running an etch kernel!
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