This bug was fixed in the package software-properties - 0.75.6
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software-properties (0.75.6) lucid; urgency=low
* Fix cdrom progress bar popping up after being canceled (LP: #496257)
* Fix adding cdrom source to top of sources list (LP: #162395)
* Fix instability after
** Branch linked: lp:~amichai2/software-properties/fixes
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software-properties-kde cdrom progress dialog reappears after canceling
https://bugs.launchpad.net/bugs/496257
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