I can't believe, people keep doing apt-get upgrade. Who tells them to do that? Might as well ask them to double click the exe file in order to install this or that,,,

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The only error message I know of the OP is the ldconfig one, that is, AFAIK ldconfig belongs to the libc6 package. The other packages I know, but how they got messed up, no clue.

Apparently packages have been removed before that are needed now. Unless you know what package had files like "install-info" and such, I don't know how to solve it.