After unpacking 779kB of additional disk space will be used.
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Reading changelogs... Done
Preconfiguring packages ...
Setting up libpam0g (0.79-3.2) ...

(Reading database ... 402095 files and directories currently installed.)
Preparing to replace mzscheme 1:352-4 (using .../mzscheme_1%3a352-4_i386.deb) ...

Stopping web server: mzserver ... start-stop-daemon: stat /usr/lib/plt/bin/mzscheme: No such file or directory (No such file or directory)
failed
invoke-rc.d: initscript mzscheme, action "stop" failed.
dpkg: warning - old pre-removal script returned error exit status 1
dpkg - trying script from the new package instead ...

Stopping web server: mzserver ... start-stop-daemon: stat /usr/lib/plt/bin/mzscheme: No such file or directory (No such file or directory)
failed
invoke-rc.d: initscript mzscheme, action "stop" failed.
dpkg: error processing /var/cache/apt/archives/mzscheme_1%3a352-4_i386.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 1
Preparing to replace libpam-modules 0.79-3.1 (using .../libpam-modules_0.79-3.2_i386.deb) ...
Unpacking replacement libpam-modules ...
Errors were encountered while processing:
 /var/cache/apt/archives/mzscheme_1%3a352-4_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)