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I cannot open pictures with type PNG, and if i open a picture, it shows me this message (Fatal error reading PNG image file: Not a PNG file) How can i solve this problem please ?

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    I think the PNG file itself is corrupted, or is different filetype renamed to .png
    – user423626
    May 8, 2016 at 11:59

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You may have a corrupt PNG library. Try reinstalling it. Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get install --reinstall libpng*-dev
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