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/usr/local/ contains files that are not installed by the package manager, be it due to a manual installation or additional files downloaded by e.g. an installer script from a package (although those mostly go to /opt/). APT is therefore unaware of the files below that directory. If you installed the libraries manually, e.g. by extracting an archive there, ...


After googling linux-libc-dev_3.2.0-84.121_amd64.deb on Ubuntu's website it gives a 404 , probably it's been deleted. Try installing it from aptitude or synaptic


You should check /usr/share/mime/packages for the specific xml that contains the phrase you get . For example, my problem was Unknown media type in type 'chemical/...... I found the file /usr/share/mime/packages/chemical-mime-data.xml. Using cat on the file showed me that the package was the same chemical-mime-data V 0.94 So I ran: sudo apt-get remove ...


For advanced users, use at your own risks. According to the following error message : subprocess installed post-installation script returned error exit status 127 You may want to edit /var/lib/dpkg/info/[package_name].postinst and comment everything (or better yet, try to understand it and identify the issue), then try apt-get again. Note that though in ...

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