Cannot attach new nodes

### Jenkins and plugins versions report

I configured the plugin, ec2 (ubuntu 24) is spinning up, in the user data im trying to install java 21, the ec2 defaults to yum install instead of apt - completly ignoring my user data.

My plugin config
```
clouds:
- amazonEC2:
instanceCapStr: "1"
name: "ec2"
region: "us-east-1"
roleArn: "arn:aws:iam::XXXXXXXXXX:role/jenkins-ec2-agent-role"
roleSessionName: "Jenkins"
sshKeysCredentialsId: "ubuntu_node"
templates:
- ami: "ami-0c1f44f890950b53c"
amiType:
unixData:
sshPort: "22"
associateIPStrategy: DEFAULT
connectBySSHProcess: false
connectionStrategy: PRIVATE_IP
deleteRootOnTermination: false
description: "ubuntu-description"
ebsEncryptRootVolume: DEFAULT
ebsOptimized: false
enclaveEnabled: false
hostKeyVerificationStrategy: 'OFF'
idleTerminationMinutes: "30"
javaPath: "/usr/bin/java"
labelString: "ubuntu"
maxTotalUses: -1
metadataEndpointEnabled: true
metadataHopsLimit: 1
metadataSupported: true
metadataTokensRequired: false
minimumNumberOfInstances: 1
minimumNumberOfSpareInstances: 0
mode: NORMAL
monitoring: false
numExecutors: 2
remoteAdmin: "ubuntu"
remoteFS: "/tmp/jenkins_home"
securityGroups: "jenkins-devops-MASTER-sg"
stopOnTerminate: false
subnetId: "subnet-0083a67434a275ab7"
t2Unlimited: false
tenancy: Default
type: "m2.xlarge"
useEphemeralDevices: false
userData: |-
#!/bin/bash
sudo apt-get install -y openjdk-21-jre-headless"
sudo mkdir -p /tmp/jenkins_home
sudo chown ubuntu:ubuntu /tmp/jenkins_home
useInstanceProfileForCredentials: false
```
Console log:
```
2025-12-09 15:12:47.178+0000 [id=44] INFO h.p.ec2.EC2RetentionStrategy#start: Start requested for EC2 (ec2) - ubuntu-description (i-0907297264fae442d)
2025-12-09 15:12:47.188+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Launching instance: i-0907297264fae442d
2025-12-09 15:12:47.194+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: bootstrap()
2025-12-09 15:12:47.195+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Getting keypair...
2025-12-09 15:12:47.243+0000 [id=44] INFO hudson.plugins.ec2.EC2Cloud#provision: SlaveTemplate{description='ubuntu-description', labels='ubuntu'}. Attempting provision finished
2025-12-09 15:12:47.243+0000 [id=44] INFO hudson.plugins.ec2.EC2Cloud#provision: We have now 2 computers, waiting for 1 more
2025-12-09 15:12:47.245+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Using private key my-ec2-key-pair (SHA-1 fingerprint ea:8e:31:8b:10:43:ab:bc:bd:51:6e:0e:41:af:de:1e:7b:3a:b3:c8)
2025-12-09 15:12:47.246+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Authenticating as ubuntu
2025-12-09 15:12:52.470+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:12.069+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:12.069+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:17.158+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:17.159+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:17.159+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:22.243+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:22.244+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:22.244+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:27.333+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:27.334+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:27.334+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:32.421+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:32.422+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:32.422+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:37.510+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:37.512+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:37.512+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:39.621+0000 [id=101] WARNING h.p.ec2.EC2RetentionStrategy#attemptReconnectIfOffline: EC2Computer EC2 (ec2) - ubuntu-description (i-0907297264fae442d) is offline
2025-12-09 15:13:42.604+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:42.605+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:42.605+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:47.694+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:47.696+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:47.696+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:52.783+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:52.784+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:52.784+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:13:57.875+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:13:57.876+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:13:57.876+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:14:02.968+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:14:02.969+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:14:02.969+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:14:08.056+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:14:08.057+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Failed to connect via ssh: DefaultConnectFuture[ubuntu@/192.168.251.4:22]: Failed (ConnectException) to execute: Connection refused
2025-12-09 15:14:08.057+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Waiting for SSH to come up. Sleeping 5.
2025-12-09 15:14:13.155+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:14:13.157+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connected via SSH.
2025-12-09 15:14:13.475+0000 [id=2698] INFO hudson.plugins.ec2.EC2Cloud#log: No SSH key verification (ecdsa-sha2-nistp256 4d:74:5e:b7:35:14:b0:e7:d2:0a:51:ff:c3:09:cb:32) for connections to EC2 (ec2) - ubuntu-description (i-0907297264fae442d)
2025-12-09 15:14:13.559+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: connect fresh as root
2025-12-09 15:14:13.642+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:14:13.645+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connected via SSH.
2025-12-09 15:14:13.866+0000 [id=2703] INFO hudson.plugins.ec2.EC2Cloud#log: No SSH key verification (ecdsa-sha2-nistp256 4d:74:5e:b7:35:14:b0:e7:d2:0a:51:ff:c3:09:cb:32) for connections to EC2 (ec2) - ubuntu-description (i-0907297264fae442d)
2025-12-09 15:14:13.885+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Creating tmp directory (/tmp) if it does not exist
2025-12-09 15:14:15.854+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Verifying: /usr/bin/java -fullversion
2025-12-09 15:14:15.900+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Installing: sudo amazon-linux-extras install java-openjdk11 -y; sudo yum install -y fontconfig java-11-openjdk
2025-12-09 15:14:16.003+0000 [id=2679] WARNING hudson.plugins.ec2.EC2Cloud#log: Failed to install: sudo amazon-linux-extras install java-openjdk11 -y; sudo yum install -y fontconfig java-11-openjdk
2025-12-09 15:14:16.003+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Verifying: which scp
2025-12-09 15:14:16.091+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Copying remoting.jar to: /tmp
2025-12-09 15:14:16.257+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Launching remoting agent (via SSH2 Connection): /usr/bin/java -jar /tmp/remoting.jar -workDir /tmp/jenkins_home
2025-12-09 15:14:16.339+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connecting to 192.168.251.4 on port 22, with timeout 10000.
2025-12-09 15:14:16.342+0000 [id=2679] INFO hudson.plugins.ec2.EC2Cloud#log: Connected via SSH.
2025-12-09 15:14:16.586+0000 [id=2707] INFO hudson.plugins.ec2.EC2Cloud#log: No SSH key verification (ecdsa-sha2-nistp256 4d:74:5e:b7:35:14:b0:e7:d2:0a:51:ff:c3:09:cb:32) for connections to EC2 (ec2) - ubuntu-description (i-0907297264fae442d)
2025-12-09 15:14:17.538+0000 [id=2708] INFO h.plugins.ec2.EC2OndemandSlave#lambda$terminate$0: Terminated EC2 instance (terminated): i-0907297264fae442d
2025-12-09 15:14:17.595+0000 [id=2708] INFO o.j.p.cloudstats.CloudStatistics#getIdFor: No support for cloud-stats-plugin by class hudson.plugins.ec2.EC2OndemandSlave
2025-12-09 15:14:17.595+0000 [id=2708] INFO h.plugins.ec2.EC2OndemandSlave#lambda$terminate$0: Removed EC2 instance from jenkins controller: i-0907297264fae442d
2025-12-09 15:16:49.119+0000 [id=103] INFO o.j.p.P.u.DropCachePeriodicWork#doRun: begin schedule clean...
2025-12-09 15:16:49.119+0000 [id=103] INFO o.j.p.P.u.DropCachePeriodicWork#doRun: end schedule clean...

```

Environment
Jenkins: 2.538
OS: Linux - 6.14.0-1017-aws
Java: 21.0.9 - Eclipse Adoptium (OpenJDK 64-Bit Server VM)
---
Parameterized-Remote-Trigger:3.2.2
ace-editor:1.1
analysis-model-api:13.15.0-928.v63f6dc44cfd2
ansible:588.v2a_a_a_f345e34f
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apache-httpcomponents-client-4-api:4.5.14-269.vfa_2321039a_83
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aws-credentials:254.v978a_5e206a_d7
aws-java-sdk:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-api-gateway:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-autoscaling:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-cloudformation:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-cloudfront:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-cloudwatch:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-codebuild:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-codedeploy:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-ec2:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-ecr:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-ecs:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-efs:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-elasticbeanstalk:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-elasticloadbalancingv2:1.12.780-480.v4a_0819121a_9e
aws-java-sdk-iam:1.12.780-480.v4a_0819121a_9e
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aws-java-sdk-ssm:1.12.780-480.v4a_0819121a_9e
aws-java-sdk2-core:2.33.4-62.vc1a_8df64b_4c9
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### What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 24

### Reproduction steps

all the info i provided in the summary

### Expected Results

plugin to install java as requested in the user data and the ec2 connects to the control plane

### Actual Results

ec2 terminated, not java install.

### Anything else?

_No response_

### Are you interested in contributing a fix?

_No response_

Start with the EC2Cloud provisioning log, especially the userData configuration and the generated Java installation command, then reproduce the Ubuntu AMI setup. Done means the configured user data is honored, Java is available at /usr/bin/java, and the EC2 agent attaches instead of being terminated.

Written by the indexing model from the issue text.