The following is what I have done up to this point:
I followed the link http://m2eclipse.sonatype.org/update/ and downloaded all the required plugins and feature jars from a machine with connectivity along with the site.xml file (which I slightly altered to removed the extra optional pieces). With this I then tested m2eclipse installation on a fresh version of eclipse on my windows box. However, when I take the same files and put them on my linux machine I get some strange errors about failures to extract osgi.bundle content from an invalid archive file Anyway, my hope is that m2eclipse (like many other eclipse plugins) is also available to download as a archive file with which I can then use the eclipse software update tool to install it from a local file system instead of requiring connectivity. Please advise.