Virtual Programming Lab (plugin)

Thank you for pointing that out. I reverted my upgrade and stoppes at Ubuntu 20.04 which is supported. The error though is still there:

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20 MIPS: Hello from MIPS R2000/R3000 Assambler language!                        
21 PASCAL: Hello from the Pascal language!                                      
22 PERL: Hello from the Perl language!                                          
23 PHP:                                                                         
Fatal error: Uncaught Error: Call to undefined function readline() in /home/p111
62/test php/message hello.php:3                                                 
Stack trace:                                                                    
#0 /home/p11162/vpl hello.php(3): hello()                                       
#1 {main}                                                                       
  thrown in /home/p11162/test php/message hello.php on line 3                   
24 PROLOG: |: Hello from the Prolog language!                                   
25 PYTHON-2: Hello from the Python2 language!                                   
26 PYTHON-3: Hello from the Python3 language!                                   
27 PYTHON: Hello from the Python language!                                      
28 RUBY: Hello from the Ruby language!                                          
29 SCALA: Hello from the Scala language!                                        
30 SCHEME: Hello from the Scheme language!                                      
31 SHELL: Hello from the Shell (Bash) language!                                 
32 SQL: Hello from the SQL language!                                            
33 TYPESCRIPT: Hello from the TypeScript language!                              
34 VERILOG: Hello from the Verilog language!