passerby wrote:You could mount /var/cache (or, more specifically, /var/cache/apt) on a separate partition.
When you download updates, they stay in /var/cache/apt/archives until you remove them.
If you have both installations mounting the same /var/cache partition, you'll only need to download updates once, then apply them separately on each.
passerby wrote:That should work, yes.
If you want to install the programs via synaptic or another such tool, copy the program's packages into /var/cache/apt/archives along with the "update" files.
Otherwise you can single out the installation file and install the .deb file manually.
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