I ran into same issue on two different Ubuntu 18.04 servers. Same basic log error.
2021-12-16 01:18:35.850+0000 [id=1] SEVERE hudson.util.BootFailure#publish: Failed to initialize Jenkins
java.nio.file.FileAlreadyExistsException: /var/lib/jenkins
at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:94)
at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
at java.base/sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:389)
at java.base/java.nio.file.Files.createDirectory(Files.java:690)
at java.base/java.nio.file.Files.createAndCheckIsDirectory(Files.java:797)
at java.base/java.nio.file.Files.createDirectories(Files.java:743)
at hudson.WebAppMain.contextInitialized(WebAppMain.java:193)
I can confirm that incremental build 2.326-rc31853.88893d10b0a2 fixed it for us.
Hi alexanderv, sorry for the trouble. Can you please provide the complete stack trace and the steps to reproduce if possible?