[ALUG] apt-get error: Dynamic MMap ran out of room

[sagr]

Our fileserver is running an ancient version of Debian:(Linux zebra
2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i586 unknown).  I thought
however it would be nice to try and install geneweb on it (if indeed
this package is available for this ancient Debian).  However when I try
to do an apt-get I receive an error message saying that MMap has run out
of room.  I am a bit confused as there is about 4GB spare in /.

What has gone wrong?

Sagr.

###################
zebra:~# apt-get install geneweb
Reading Package Lists... Error!
E: Dynamic MMap ran out of room
E: Error occured while processing libobjc-lf2-dev (NewVersion1)
E: Problem with
MergeList /var/lib/apt/lists/ftp.uk.debian.org_debian_dists_stable_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.
zebra:~# df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hdc5              5763616   1428352   4042484  27% /
/dev/hdc7             28834716   2093684  25276308   8% /home
/dev/hdc8              1921156   1074024    749540  59% /shared/CDROM
/dev/hdc10            36131688        20  34296244   1% /backups
zebra:~#