Krdytkyu

This shows that Gradle is up to date:

thufir@doge:~$ sudo apt install gradle

Reading package lists... Done

Building dependency tree       

Reading state information... Done

gradle is already the newest version (2.10-1).

0 upgraded, 0 newly installed, 0 to remove and 629 not upgraded.

How do I upgrade to Gradle 4.x? Preferably, with umake rather than SDKMAN! which seems to be what they suggest.

(I don't want to update all the packages due to a slow connection.)

You could use the ppa:

sudo add-apt-repository ppa:cwchien/gradle

sudo apt-get update

sudo apt upgrade gradle

You can also tell Gradle to update itself using a Gradle wrapper.

First you create the wrapper, then tell it to use the Gradle version of your choice:

gradle wrapper

./gradlew wrapper --gradle-version 4.9

Now this project will use Gradle 4.9, independent of what's installed.
However, you need to remember to run Gradle through the wrapper, i.e., run ./gradlew instead of plain gradle.

The wrapper allows you to have different projects using different Gradle versions easily.

When you commit the created wrapper to source control, everybody who checks out the project will use the same Gradle version. This can help a lot with incompatible build scripts, when something has changed between Gradle versions.