Actually need clarification regarding a security issue. For example, https://ubuntu.com/security/notices/USN-3891-1 mentions libsystemd0 and systemd. And https://ubuntu.com/security/notices/USN-3855-1 mentions only systemd. So does this mean, for USN-3891-1, we need to update both libsystemd0 and systemd but for USN-3855-1, upgrading only systemd package will fix the vulnerabilities? Actually, https://packages.ubuntu.com/search?suite=all§ion=all&arch=any&searchon=sourcenames&keywords=systemd mentions a lot of other binaries for the source systemd. Yes, we understand that you previously mentioned that upgrading only few binaries might break the package dependency. But here, we are concerned mainly on resolving the security issue and if a binary is having dependency on some other binary it would automatically upgrade the other one. So, is it sufficient if we upgrade the mentioned binaries in USN links for fixing the security issues by ignoring other binaries?
The issue was previously asked in https://answers.launchpad.net/ubuntu/+question/701006/, where they suggested to ask security issues here.