Comment 2 for bug 1771630

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Andreas Hasenack (ahasenack) wrote : Re: package mysql-server-5.7 (not installed) failed to install/upgrade: installed mysql-server-5.7 package post-installation script subprocess returned error exit status 127

Thanks for filing this bug in Ubuntu.

The error you got is unusual:
/var/lib/dpkg/info/mysql-server-5.7.postinst: line 191: /usr/share/mysql-common/configure-symlinks: No such file or directory

I suggest the following steps:

sudo apt update
sudo apt -f install