When I enter the Application Manager and try to refresh the application list I get this message:

Application list partially refreshed.
Some catalogs unavailable.
Check catalog details.

When I check the catalog details, every repository listed shows this error: Sub-process gzip returned an error code (100)

The list of installable applications is blank after this.

Any ideas?

From the command line, as root, run "apt-get update" and see what that produces (should do the same thing as the app manager, but might give you more output). Then you'll need to check that gzip works (you've not broken the symlink to it for example), that files you download are not zero-sized or corrupted, etc.

You might also want to look at the source for app manager and gzip and work out what that error code means.

I had to reinstall or reflash my Nokia n810 in order for it to work. I went to the nokia site to do it from my laptop. I wish to someday understand xtermial. Thanks to all for this site and all who as helped. I'll return the favor when i understand more.