Plesk on Ubuntu 16.04: 'error while loading shared libraries:'

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Joined: Oct 2007

Just had this weird issue installing Plesk on a new Ubuntu 16.04 server:

error while loading shared libraries:

(I imagine the number at the end may change according to whichever version of the library it's trying to load.)

I solved it by running:

sudo apt install libicu55

Apparently the missing file is a Unicode library, presumably used for Plesk's internationalisation. Totally safe to install.