The jffs2 compressed file system does not allow umap/mmap to write to the cache. The apt-get package tool requires umap/mmap to write to the cache. The work around is to redirect the cache to a SD card or any other media that allows umap/mmap. The following steps demostrate a work around to allow apt-get to run on a JFFS root file system.
mount -t tmpfs none /var/cache/apt
mkdir -p /var/cache/apt/archives/partial
apt-get update ; apt-get install <package-name>
umount /var/cache/apt
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