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I'm sort of a beginner and I couldn't find this anywhere, how do I uninstall java 14?

I have java 14 and 8 installed and set 8 as default, but the launcher still tries to boot up with java 14

Bootstrap (v5)
Current time is Oct 29, 2020, 12:32:02 PM
System.getProperty('os.name') == 'Linux'
System.getProperty('os.version') == '5.9.1-1-MANJARO'
System.getProperty('os.arch') == 'amd64'
System.getProperty('java.version') == '14.0.2'
System.getProperty('java.vendor') == 'N/A'
System.getProperty('sun.arch.data.model') == '64'

Looking for update
Downloading: https://s3.amazonaws.com/Minecraft.Download/launcher/launcher.pack.lzma
Got reply in: 1065ms
No update found.
Reversing LZMA on /home/activateubuntu/.minecraft/launcher.pack.lzma to /home/activateubuntu/.minecraft/launcher.pack
Unpacking /home/activateubuntu/.minecraft/launcher.pack to /home/activateubuntu/.minecraft/launcher.jar
FATAL ERROR: java.lang.NoClassDefFoundError: java/util/jar/Pack200
at net.minecraft.bootstrap.Bootstrap.unpack(Bootstrap.java:157)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:123)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:381)
Caused by: java.lang.ClassNotFoundException: java.util.jar.Pack200
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 3 more

Please fix the error and restart.

full report btw

everytime I try to boot the minecraft launcher, I get this error:
FATAL ERROR: java.lang.NoClassDefFoundError: java/util/jar/Pack200
at net.minecraft.bootstrap.Bootstrap.unpack(Bootstrap.java:157)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:123)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:381)
Caused by: java.lang.ClassNotFoundException: java.util.jar.Pack200
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 3 more

can anyone help me?