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At Preview Ubuntu is not supported. The distribution for Ubuntu will be available at GA, which is planned for Q1 2019. See this AWS blog

For the most part, I was able to check out the Corretto sources and build from there after making two patches. Note that this is obviously not supported by Amazon. If you want a supported distribution, wait until it's released with the GA release. This should be obvious, but I've come to know better than to make assumptions here: Do not try this or anything like it on a production or shared system.

OTOH, if you like to experiment and break things, read on!

1. Check out the Corretto source tree.

git clone git@github.com:corretto/corretto-8.git

2. Apply patches.

I encountered two compilation errors (likely due to different compiler versions on Amazon Linux 2 vs Ubuntu 18.04.1 LTS).

% patch -p1
diff --git a/src/hotspot/src/share/vm/code/dependencies.cpp b/src/hotspot/src/share/vm/code/dependencies.cpp
index c284160e..c4c8e9b4 100644
--- a/src/hotspot/src/share/vm/code/dependencies.cpp
+++ b/src/hotspot/src/share/vm/code/dependencies.cpp
@@ -525,7 +525,7 @@ void Dependencies::write_dependency_to(xmlStream* xtty,
 xtty->object("x", arg.metadata_value());
 }
 } else {
- char xn[10]; sprintf(xn, "x%d", j);
+ char xn[12]; sprintf(xn, "x%d", j);
 if (arg.is_oop()) 
 xtty->object(xn, arg.oop_value());
 else 
diff --git a/src/hotspot/src/share/vm/runtime/fprofiler.cpp b/src/hotspot/src/share/vm/runtime/fprofiler.cpp
index 58cb6e89..89aa0cd8 100644
--- a/src/hotspot/src/share/vm/runtime/fprofiler.cpp
+++ b/src/hotspot/src/share/vm/runtime/fprofiler.cpp
@@ -635,7 +635,7 @@ class vmNode : public ProfilerNode improve this answer

For the most part, I was able to check out the Corretto sources and build from there after making two patches. Note that this is obviously not supported by Amazon. If you want a supported distribution, wait until it's released with the GA release. This should be obvious, but I've come to know better than to make assumptions here: Do not try this or anything like it on a production or shared system.

OTOH, if you like to experiment and break things, read on!

1. Check out the Corretto source tree.

git clone git@github.com:corretto/corretto-8.git

2. Apply patches.

I encountered two compilation errors (likely due to different compiler versions on Amazon Linux 2 vs Ubuntu 18.04.1 LTS).

% patch -p1
diff --git a/src/hotspot/src/share/vm/code/dependencies.cpp b/src/hotspot/src/share/vm/code/dependencies.cpp
index c284160e..c4c8e9b4 100644
--- a/src/hotspot/src/share/vm/code/dependencies.cpp
+++ b/src/hotspot/src/share/vm/code/dependencies.cpp
@@ -525,7 +525,7 @@ void Dependencies::write_dependency_to(xmlStream* xtty,
 xtty->object("x", arg.metadata_value());
 
 else {
- char xn[10]; sprintf(xn, "x%d", j);
+ char xn[12]; sprintf(xn, "x%d", j);
 if (arg.is_oop()) 
 xtty->object(xn, arg.oop_value());
 else 
diff --git a/src/hotspot/src/share/vm/runtime/fprofiler.cpp b/src/hotspot/src/share/vm/runtime/fprofiler.cpp
index 58cb6e89..89aa0cd8 100644
--- a/src/hotspot/src/share/vm/runtime/fprofiler.cpp
+++ b/src/hotspot/src/share/vm/runtime/fprofiler.cpp
@@ -635,7 +635,7 @@ class vmNode : public ProfilerNode 
 const char *name() const return _name; 
 bool is_compiled() const return true; 

- bool vm_match(const char* name) const return strcmp(name, _name) == 0; 
+ bool vm_match(const char* name) const return name == NULL ? false : strcmp(name, _name) == 0; 

 Method* method() return NULL; 

Then press Ctrl+D twice. You should see:

patching file src/hotspot/src/share/vm/code/dependencies.cpp
patching file src/hotspot/src/share/vm/runtime/fprofiler.cpp

3. Install dependencies.

This may be a bit of a cat-and-mouse game. In my case, I had everything I needed except for libcups2-dev and libasound2-dev.

apt install -y libcups2-dev libasound2-dev

The configure step (next) was amazingly clear about what it thought was missing.

4. Configure

Configure the source tree:

cd src
./configure

If all goes well, the last lines will say something like:

A new configuration has been successfully created in
/home/dacut/projects/corretto-8/src/build/linux-x86_64-normal-server-release
using default settings.

Configuration summary:
* Debug level: release
* JDK variant: normal
* JVM variants: server
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64

Tools summary:
* Boot JDK: openjdk version "1.8.0_181" OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-1ubuntu0.18.04.1-b13) OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) (at /usr/lib/jvm/java-8-openjdk-amd64)
* Toolchain: gcc (GNU Compiler Collection)
* C Compiler: Version 7.3.0 (at /usr/bin/gcc)
* C++ Compiler: Version 7.3.0 (at /usr/bin/g++)

Build performance summary:
* Cores to use: 7
* Memory limit: 15757 MB

If this was the case, go on!

If not, you'll see an error message. In my case they were quite helpful:

configure: error: Could not find cups! You might be able to fix this by running 'sudo apt-get install libcups2-dev'. 
configure exiting with result code 1

configure: error: Could not find alsa! You might be able to fix this by running 'sudo apt-get install libasound2-dev'. 
configure exiting with result code 1

Install what it advises (step 3), then try again. This may take a few iterations since you only get one message per configure run.

5. Compile

Run make. If all goes well, you'll see something like the following at the end:

## Finished jdk (build time 00:02:07)

----- Build times -------
Start 2018-11-24 13:30:24
End 2018-11-24 13:35:36
00:00:19 corba
00:02:18 hotspot
00:00:12 jaxp
00:00:16 jaxws
00:02:07 jdk
00:00:00 langtools
00:05:12 TOTAL
-------------------------
Finished building OpenJDK for target 'default'

If not... well, now you're deep into the experimentation part.

6. Install

sudo make install

You'll now have a Corretto build in /usr/local/jvm/openjdk-1.8.0-internal.

Disclaimer: Although I work for AWS, this is purely my personal experimentation and I'm speaking for myself only. These steps are neither sanctioned nor endorsed by Amazon or the Corretto team. Proceed with caution!