Apply factory reset without total data erase

I want to do a Factory reset withour lose all data because my OS is broken.

There is a dependences problem and a OS reinstall doesn't the solution:

The following packages have unmet dependencies:
binutils: Depends: libc6 (>= 2.11) but 2.7-18lenny7 is to be installed
Depends: libstdc++6 (>= 4.6) but 4.3.2-1.1 is to be installed
cpp-4.7: Depends: libc6 (>= 2.11) but 2.7-18lenny7 is to be installed
fontconfig: Depends: libfontconfig1 (>= 2.4.0) but it is not going to be installed
Depends: fontconfig-config but it is not going to be installed
g++-4.7: Depends: libc6 (>= 2.11) but 2.7-18lenny7 is to be installed
gcc-4.7: Depends: libgcc1 (>= 1:4.7.2-5) but 1:4.3.2-1.1 is to be installed
Depends: libc6 (>= 2.11) but 2.7-18lenny7 is to be installed
lftp: Depends: libgnutls26 (>= 2.12.17-0) but 2.8.6-1 is to be installed
libc-bin: Breaks: libc6 (< 2.10) but 2.7-18lenny7 is to be installed
libc-dev-bin: Depends: libc6 (> 2.13) but 2.7-18lenny7 is to be installed
libc6-dev: Depends: libc6 (= 2.13-38) but 2.7-18lenny7 is to be installed
libncurses5-dev: Depends: ncurses-bin (= 5.7+20100313-5) but 5.5-5 is to be installed
libquadmath0: Depends: libc6 (>= 2.10) but 2.7-18lenny7 is to be installed
libreadline6: Depends: libc6 (>= 2.11) but 2.7-18lenny7 is to be installed
libstdc++6-4.7-dev: Depends: libstdc++6 (>= 4.7.2-5) but 4.3.2-1.1 is to be installed
multiarch-support: Depends: libc6 (>= 2.13-5) but 2.7-18lenny7 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).