While Android Studio brings with it its own version of Java, the (now mostly obsolete) Android Device Monitor (ADM) depends on the version of Java installed on your computer. From other bug reports on the Internet, it seems that ADM needs Java 8 ( here ). It also means that our machines are different from each other. As I noted in the comment above, I am also on Ubuntu 17.10, Android Sdk 27 ββand Android Studio 3.0, however, I have Java 8 installed and ADM works fine.
Therefore, I suggest you add Java 8 to your computer and make it a standard version. On Ubuntu, you can do it like this:
sudo add-apt-repository ppa:webupd8team/java // only necessary if repository not yet added sudo apt-get update // only necessary if repository not yet added sudo apt-get install oracle-java8-installer sudo apt-get install oracle-java8-set-default
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