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This question already has an answer here:

The upgrade needs a total of 87.5 M free space on disk '/boot'. Please free at least an additional 32.8 M of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.

marked as duplicate by Richard, Avinash Raj, Eric Carvalho, Mitch, To Do Feb 22 '14 at 16:56

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Use sudo apt-get autoclean

Also FSlint is a utility which scans the entire FS (filesystem hence the name FSlint) for anything that can be removed including whitespaces (there might be a better one)

there is also remove orphaned packages tool which does you know what

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