I run Xubuntu 12.04 as my main install. Recently I have been evaluating text editors for editing .xml files. For the evaluations, I have been installing the editors in a VirtualBox guest running Xubuntu 13.04 because I didn't want to junk up my main install until I had settled on a candidate. One of the candidates I installed was Kate (which I like the best so far). The files I have been editing during my testing are located in a directory on my main Xubuntu host. A few days after I started the testing, I got a software update notification on my main install showing some 33 updates, all of which were KDE libraries.
So my question is: why did those updates appear? As far as I know, I haven't tried to install any KDE stuff on my 12.04 install. Could the mere fact that I have been modifying .xml files from a mounted 12.04 host partition have somehow triggered the updates?
A related question is: how badly is my Xubuntu 12.04 install compromised by having the foreign libs? Can I expect it to be less reliable or slower?