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If you have postfix installed, try postmap -s <database-file-name> For example, with the two files virtual and virtual.db, where virtual is the text file from which virtual.db was made with makemap, use postmap -s virtual Note that you do not have to specify the .db extension.


Since 14.04 [universe] there is the vwebp command in the webp package: sudo apt install webp Then: vwebp imagefile.webp To get thumbnails in Nautilus see this answer (like Aquarius Power said above).

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