scala crashes right after launch

[Kerne MacDonald Fahey]

When I launch /usr/bin/scala with no arguments, it presents this welcome like I assume is normal:

```
Welcome to Scala 2.11.12 (OpenJDK 64-Bit Server VM, Java 19.0.2).
Type in expressions for evaluation. Or try :help.
```

And then a few seconds later it crashes with a very long java stack trace:

```
Welcome to Scala 2.11.12 (OpenJDK 64-Bit Server VM, Java 19.0.2).
Type in expressions for evaluation. Or try :help.
Exception in thread "Thread-1" java.lang.NoClassDefFoundError: org/fusesource/jansi/AnsiOutputStream
 at jline.internal.Ansi.stripAnsi(Ansi.java:28)
 at jline.console.ConsoleReader.setPrompt(ConsoleReader.java:499)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2425)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2378)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2366)
 at scala.tools.nsc.interpreter.jline.InteractiveReader.readOneLine(JLineReader.scala:59)
 at scala.tools.nsc.interpreter.InteractiveReader$class.readLine(InteractiveReader.scala:38)
 at scala.tools.nsc.interpreter.jline.InteractiveReader.readLine(JLineReader.scala:27)
 at scala.tools.nsc.interpreter.SplashReader.readLine(InteractiveReader.scala:142)
 at scala.tools.nsc.interpreter.SplashLoop.run(InteractiveReader.scala:71)
 at java.base/java.lang.Thread.run(Thread.java:1589)
Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.AnsiOutputStream
 at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
 at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
 at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
 ... 11 more

Failed to initialize compiler: NoClassDefFoundError.
This is most often remedied by a full clean and recompile.
Otherwise, your classpath may continue bytecode compiled by
different and incompatible versions of scala.

java.lang.NoClassDefFoundError: org/fusesource/jansi/AnsiOutputStream
 at jline.internal.Ansi.stripAnsi(Ansi.java:28)
 at jline.console.ConsoleReader.setPrompt(ConsoleReader.java:499)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2425)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2378)
 at jline.console.ConsoleReader.readLine(ConsoleReader.java:2366)
 at scala.tools.nsc.interpreter.jline.InteractiveReader.readOneLine(JLineReader.scala:59)
 at scala.tools.nsc.interpreter.InteractiveReader$class.readLine(InteractiveReader.scala:38)
 at scala.tools.nsc.interpreter.jline.InteractiveReader.readLine(JLineReader.scala:27)
 at scala.tools.nsc.interpreter.ILoop.readOneLine(ILoop.scala:413)
 at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:425)
 at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:993)
 at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:891)
 at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:891)
 at scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
 at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:891)
 at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
 at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
 at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
 at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
 at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.AnsiOutputStream
 ... 20 more
```

That's it, that's the entire problem. It's pretty dire though.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: scala 2.11.12-5
ProcVersionSignature: Ubuntu 5.19.0-35.36-generic 5.19.17
Uname: Linux 5.19.0-35-generic x86_64
ApportVersion: 2.23.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Mar 20 20:38:32 2023
InstallationDate: Installed on 2022-12-24 (86 days ago)
InstallationMedia: Xubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
PackageArchitecture: all
SourcePackage: scala
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Petr Skovron (xofon)]

Workaround:

# apt-get install libjansi1-java
# cd /usr/share/scala-2.11/lib
# mv jansi.jar jansi.jar--
# ln -s /usr/share/java/jansi1.jar jansi.jar

Background: /usr/share/scala-2.11/lib/jansi.jar is a softlink to /usr/share/java/jansi.jar, which is v2.4.0. In this version some classes were moved to a different namespace:
https://github.com/fusesource/jansi/commit/04d771c3c7f2a4c29301191e65e7ce3cdeb92918