The kernel you just downloaded is 4.4-CURRENT(or 4.5-BETA), the fact that it's working is a good thing.. by the time 4.5 is released you'll be able to use it.
Using the 4.4-CURRENT(or 4.5-BETA) kernel with a user land from 4.4-RELEASE is not a good idea, as mentioned, the -s argument you passed at the boot prompt enabled single user mode.. going multiuser is definitely not recommended.
You have a few options, upgrade to a snapshot.. which will require what's essentially a reinstall, or wait until 4.5 is released in May.
Hope it helps.. again, feel free to post back if you need further assistance.
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