Note: There are some limitations for installing DB2 as non-root user. So, it is better to switch to root user (using "su root" command) first before installing DB2.
Note: If you get any missing libraries errors, do not run ./db2setup -f sysreq to force installation; instead, install the missing libraries first. You can use synaptic package manager on Ubuntu to get those libraries. For instance, the setup tool seems to require the package rpm.
Note: If you start the setup as root user, you may get the following error: "Can't connect to X11 window server using ':0' as the value of the DISPLAY variable." In this case, open another terminal and (as the normal user) run the following command: xhost +
Note, I have not tested the following installation steps because I do not have a Windows machine. I have just copied these steps from previous year's. Please let me know if the steps need adjustment (and what these adjustments are).
Dec. 4, 2012. Olaf Hartig