We were unfamiliar with "XPCOM error -2147221164" so we did a Google search on "SWT XPCOM error". Quite a bit of interesting material is available that might help resolve the problem...
"The SWT Browser on Linux requires that you have the MOZILLA_FIVE_HOME environment variable set and you also have the linkable Gecko libraries"
It appears to be a generic SWT Linux browser configuration / compatibility issue that affects any
Eclipse plugin that needs to interact with SWT's browser support. According to the SWT FAQ entry above, Eclipse expects the local Linux environment to be configured a certain way. According to the FAQ entry, certain Linux distributions are configured properly out-of-the-box, while others need additional pieces installed and need to have the MOZILLA_FIVE_HOME
environment variable configured.
BTW, according to the Eclipse.org web site, Eclipse officially only supports certain Linux distributions, and I don't see Kubuntu on that list...
http://www.eclipse.org/eclipse/developm ... vironments
That basically means that Eclipse is not tested in that environment (it may work fine for the most part, but might need some additional setup as outlined in the SWT FAQ).