Public bug reported:

I installed a new focal host with following

apt-cache policy zookeeper
zookeeper:
  Installed: 3.4.13-5build1
  Candidate: 3.4.13-5build1


apt-cache policy openjdk-8-jre-headless 
openjdk-8-jre-headless:
  Installed: 8u265-b01-0ubuntu2~20.04
  Candidate: 8u265-b01-0ubuntu2~20.04


Zookeper process starts but you can't connect to it. I get the following error 
in zookeeper logs

2020-09-30 13:51:35,284 - INFO  
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@215] - Accepted 
socket connection from /127.0.0.1:42324
2020-09-30 13:51:35,289 - WARN  
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperThread@60] - Exception 
occurred from thread NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181
java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer;
        at 
org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:256)
        at 
org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:226)
        at java.lang.Thread.run(Thread.java:748)

** Affects: zookeeper (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1897844

Title:
  Focal package doesn't work

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