Reading database ... 120611 files and directories currently installed.)
Unpacking libpth20 (from .../libpth20_2.0.7-8_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libpth20_2.0.7-8_i386.deb (--unpack):
 trying to overwrite `/usr/lib/libpth.so.20.0.27', which is also in package libpth2
Errors were encountered while processing:
 /var/cache/apt/archives/libpth20_2.0.7-8_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)