To run instiki on Ubuntu Dapper you need the following packages:
apt-get install ruby apt-get install libsqlite3-ruby1.8
Now untar instiki and run it:
tar -zxvf instiki-0.11.0.tgz cd instiki-0.11.0 ./instiki
Now Instiki should be running on port 2500.
By default, when you install Ruby on Ubuntu Hoary (using the package available in main), some libraries needed by Instiki will not be installed.
Therefore to get it running you need to:
apt-get install ruby1.8 apt-get install libwebrick-ruby1.8 apt-get install libstrscan-ruby1.8 apt-get install rdoc1.8 apt-get install libzlib-ruby1.8 apt-get install libsoap-ruby1.8 apt-get install libyaml-ruby1.8 apt-get install libdrb-ruby1.8
Ubuntu puts Ruby in the right place, so no modifications to your instiki script is necessary. Unpack the instiki download, and run “ruby1.8 instiki” in this folder.