It worked!
cat /etc/apt/sources.list.d/plesk.list
## Persistent repositories for Plesk Products.
deb https://autoinstall.plesk.com/ubuntu/PSA_17.8.11 xenial extras
deb https://autoinstall.plesk.com/ubuntu/PHP56_17 xenial all
deb https://autoinstall.plesk.com/ubuntu/PHP70_17 xenial all
deb...
Hi all.
When trying to run apt update on our Ubuntu 16.04 Plesk servers in the last few days (since at least 6 May), the update fails with the following (end of output):
Hit:15 https://autoinstall.plesk.com/pool/PHP_7.1.33_96 xenial InRelease
Hit:16...