If use 1.13 in old launcher (1.6.89j), it works only if there is internet. If there is no internet I'm getting this in output:
Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
this is 1.13 specific. Other versions works.
Unlike new launcher native(old) launcher works with JavaPortableLauncher (which makes Minecraft portable), so really hope that it will be fixed!
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Can confirm
I have exactly the same problem (only affects 1.13, older version still start when offline).
Launcher version is also 1.6.89-j game always crashes when offline, but runs fine when online.
Tested on two machines running Ubuntu (I even deleted the ".minecraft" folder an re downloaded, problem still there)
Error: Could not find or load main class net.minecraft.client.main.Main
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.main.Main
see more:
[media]
Can confirm in the latest legacy 1.6.91 launcher