Unresolved dependency: org.scala-sbt#sbt;0.13: not found when running sbt 0.13?

Try using 0.13.1.

Put the following in project/build.properties:

sbt.version=0.13.1

You will probably need the 0.13 sbt launcher as well. See sbt Getting-Started - Setup

I had the same issue when first installing openjdk-9-jdk and then openjdk-8-jdk on Ubuntu.

I ended up uninstalling both, rm -rfing /etc/ssl/certs/java and /etc/java-*, reinstalling openjdk-8-jdk and running sudo update-ca-certificates -f, which fixed it for me.