Jeb tweeted the links to the 1.9.5 client and server today. If you missed them, here they are:
Note: This is outdated. For the updated client, check this page.
Ubuntu Client Installation:
# Backup your old client, just in case mv ~/.minecraft/bin/minecraft.jar ~/.minecraft/bin/minecraft.jar.bak # Download the new one cd ~/.minecraft/bin; wget http://assets.minecraft.net/1_9-pre5/minecraft.jar # And play like normal! minecraft # If you didn't alias this: java -Xmx1024M -Xms512M -cp Minecraft.jar net.minecraft.LauncherFrame
And for the Ubuntu-based server installation:
# Stop the server stopmc # Or if you haven't followed my tutorials, get to your console (tmux or screen) and type "stop". # Backups are important! mv ~/minecraft/minecraft_server.jar ~/minecraft/minecraft_server.jar.bak # Get the new one cd ~/minecraft; http://assets.minecraft.net/1_9-pre5/minecraft-server.jar # Start minecraft again! startmc