okay. swap wasn't working. it is now and i will test the system for some time. 
also task manager's preferences had 'show all processes' unchecked, so hope 
some mysterious cpu use will now be indicated.
strange how nobody directed me neither to swap (i myself made it bigger 
sometime ago suspecting memory problems) nor to 'show all processes' despite 
numerous requests on #ubuntu. 
'fresh install' was the usual reply. however, the real 'bug' seems to be why 
the problem bothers me for a few years already, even though ubuntu was freshly 
installed at 11.04, as far as i remember, and generally i did up to 10 fresh 
installs since 2008. there's one trace - 'sudo fdisk -l' states 'partition 
table entries are in different order than on disk'. 
but still why ubuntu would install and work for so long without swap (swap 
partition WAS being prepared during installs) and give no indication of it is 
beyond me.

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https://bugs.launchpad.net/bugs/889815

Title:
  hidden 100% cpu usage

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