There is a debconf setting in the ca-certificates package:
ca-certificates/trust_new_crts: yes
It is set to yes by default, which means new certificates gets imported
without user intervention.
In your case, it seems that setting was modified, hence you are getting
prompted.
You can check your current setting by doing:
debconf-show ca-certificates
** Changed in: ca-certificates (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1297800
Title:
During upgrades, new certificates will be added. Please choose those
you trust.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1297800/+subscriptions
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