[temurin-compliance] Xvfb failed to start in jck-scaleway-ubuntu2404-riscv64-2
## Summary
Xvfb is failed to start, seems "Keyboard initialization failed" and "Failed to activate virtual core keyboard: 2"
```
[2026-07-21T22:50:59.597Z] + which Xvfb
[2026-07-21T22:50:59.597Z] /usr/bin/Xvfb
[Pipeline] wrap
[2026-07-21T22:51:00.183Z] $ Xvfb -displayfd 2 -screen 0 1024x768x24 -fbdir /home/jenkins/workspace/Test_openjdk26_hs_sanity.jck_riscv64_linux/.xvfb-30-..fbdir11181557079223124425
[2026-07-21T22:51:20.449Z] Xvfb starting_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root
[2026-07-21T22:51:20.449Z] XKB: Failed to compile keymap
[2026-07-21T22:51:20.449Z] Keyboard initialization failed. This could be a missing or incorrect setup of xkeyboard-config.
[2026-07-21T22:51:20.449Z] (EE)
[2026-07-21T22:51:20.449Z] Fatal server error:
[2026-07-21T22:51:20.449Z] (EE) Failed to activate virtual core keyboard: 2(EE)
[2026-07-21T22:51:20.449Z]
[2026-07-21T22:51:20.449Z] ERROR: Xvfb failed to start, consult the lines above for errors
```
## Steps to reproduce
https://ci.eclipse.org/temurin-compliance/job/Test_openjdk26_hs_sanity.jck_riscv64_linux/30/consoleText
## What is the current bug behavior?
Many JCK Compliance tests cannot be ran on this platform.
## What is the expected correct behavior?
JCK Compliance tests can be ran
## Relevant logs and/or screenshots
See above
## Priority
- [X] Urgent
- [ ] High
- [ ] Medium
- [ ] Low
## Severity
- [X] Blocker
- [ ] Major
- [ ] Normal
- [ ] Low
## Impact
Affects ongoing TCK Compliance testing for 2026-07 on this platform.
issue