Ubuntu 18.04 Server update crashed web access of openfire 4.5.3

Openfire Plugins openfire-meetings
1

This week update for ubuntu server 18.04 LTS crashed my openfire server. I can’t log in and I have no web access, so what can I do?
Log give this:

2020.09.08 22:15:45 INFO  [org.jitsi.util.concurrent.RecurringRunnableExecutor.thread-org.jitsi.videobridge.health.Health]: org.jitsi.videobridge.Videobridge - CAT=stat create_
2020.09.08 22:15:45 ERROR [org.jitsi.util.concurrent.RecurringRunnableExecutor.thread-org.jitsi.videobridge.health.Health]: org.jitsi.util.concurrent.RecurringRunnableExecutor 
java.lang.NoClassDefFoundError: org/bouncycastle/crypto/tls/Certificate
        at org.jitsi.impl.neomedia.transform.dtls.DtlsControlImpl.generateCertificateInfo(DtlsControlImpl.java:388) ~[libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.impl.neomedia.transform.dtls.DtlsControlImpl.<init>(DtlsControlImpl.java:628) ~[libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.videobridge.IceUdpTransportManager.createDtlsControl(IceUdpTransportManager.java:1024) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.IceUdpTransportManager.<init>(IceUdpTransportManager.java:563) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.IceUdpTransportManager.<init>(IceUdpTransportManager.java:526) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.Channel.createTransportManager(Channel.java:322) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.Channel.initialize(Channel.java:673) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.RtpChannel.initialize(RtpChannel.java:891) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.Content.createRtpChannel(Content.java:339) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.Content.createRtpChannel(Content.java:263) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.health.Health.check(Health.java:152) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.health.Health.doCheck(Health.java:244) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.videobridge.health.Health.doRun(Health.java:495) ~[jitsi-videobridge-1.1-20190125.162313-103.jar!/:?]
        at org.jitsi.util.concurrent.PeriodicRunnableWithObject.run(PeriodicRunnableWithObject.java:87) ~[libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.util.concurrent.RecurringRunnableExecutor.run(RecurringRunnableExecutor.java:216) [libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.util.concurrent.RecurringRunnableExecutor.runInThread(RecurringRunnableExecutor.java:292) [libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.util.concurrent.RecurringRunnableExecutor.access$000(RecurringRunnableExecutor.java:36) [libjitsi-1.0-20190128.210332-374.jar!/:?]
        at org.jitsi.util.concurrent.RecurringRunnableExecutor$1.run(RecurringRunnableExecutor.java:328) [libjitsi-1.0-20190128.210332-374.jar!/:?]
2020.09.08 22:15:55 INFO  [org.jitsi.util.concurrent.RecurringRunnableExecutor.thread-org.jitsi.videobridge.health.Health]: org.jitsi.videobridge.Videobridge - CAT=stat create_
2020.09.08 22:15:55 WARN  [EndpointConnectionStatusMonitoring]: org.jitsi.videobridge.EndpointMessageTransport - SCTP connection with 34c33a2302d9f653 not ready yet.
2020.09.08 22:15:55 WARN  [EndpointConnectionStatusMonitoring]: org.jitsi.videobridge.EndpointMessageTransport - No available transport channel, can't send a message
2020.09.08 22:15:55 ERROR [org.jitsi.util.concurrent.RecurringRunnableExecutor.thread-org.jitsi.videobridge.health.Health]: org.jitsi.util.concurrent.RecurringRunnableExecutor 
java.lang.NoClassDefFoundError: org/bouncycastle/crypto/tls/Certificate

Is there a chance to deinstall the Meetings plugin from the command line?

2

Create a backup first. In the Openfire home folder, There’s a directory named “plugins”. Remove the dot-jar files from there. Do not remove the admin directory!

3

Where do I find the Openfire home folder? etc/openfire not such directory.

4

Try /var/lib/openfire/plugins/

5

I have ubuntu server 20.04 now. And I have the same problem as before. Every big update of ubuntu crashes openfire. Than I have to purge openfire and install new. After that it is working fine, but it is annoying to do. How can I protect openfire from OS updates?
OS Ubuntu 20.04 LTS with gui
Mysql version 8
OpenJDK11