Comment 5 for bug 227128

okay, log files are now attached.

From your response I'm not sure if the substance of my bug report is understood: I'm not reporting, so much, that update-manager doesn't like the proprietary nvidia drivers, rather that the popup error message is vague and that if it were more direct about telling people to look at the logfiles it might potentially save frustration and needless searching about and uninstalling of unofficial program X which may be entirely innocent.

<blockquote>
Could not calculate the upgrade

A unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

<strong>If none of this applies, then</strong> please report this bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport.
</blockquote> (emphasis added)

I had initially skipped over the last sentence, containing the path to the logfiles, because of the wording in the first phrase: "If none of this applies". I saw those words, noted that I am running unofficial packages, and so stopped reading because obviously the rest wasn't for me.

I would have let it sit there and not bothered you with a bug report here, except that in my searches I encountered a number of threads on ubuntu forums and in the mailing list where others had made the same hasty mistake I did. Perhaps if the wording were changed a bit or there was a button to open the logfile directory it would divert some of the needless casting about.