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help... lost database after upgrade from 9.0 to 9.1

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Hello!                                                                                      
                                                                                            
just made a stupid move... upgraded a working system.... and without                        
checking if the backup was ok....                                                           
                                                                                            
so i end up with a debian system having upgraded to 9,1 without                             
converting the database, and a scrambled backup which is totally                            
unusable....                                                                                
                                                                                            
i tried to start the old tree with                                                          
pg_ctlcluster 9.0 main start                                                                
Error: could not exec   start -D /var/lib/postgresql/9.0/main -l                            
+/var/log/postgresql/postgresql-9.0-main.log -s -o  -c                                      
+config_file="/etc/postgresql/9.0/main/postgresql.conf" :                                   
                                                                                            
                                                                                            
so i tried to copy the old 9.0 tree to a machine with a still working 9,0                   
postgres, but it stops with                                                                 
Starting PostgreSQL 9.0 database server: mainError: could not exec                          
/usr/lib/postgresql/9.0/bin/pg_ctl /usr/lib/postgresql/9.0/bin/pg_ctl                       
start -D /var/lib/postgresql/9.0/main -l                                                    
/var/log/postgresql/postgresql-9.0-main.log -s -o -c                                        
config_file="/etc/postgresql/9.0/main/postgresql.conf" : ... failed!                        
 failed!                    


so what can i do to extract the data of that tree and feed it into the                     
 9.1 tree?                                                                                  
                                                                                            
 thanks in avance!                
-- 
ciao bboett
==============================================================
bboett@xxxxxxxx
http://inforezo.u-strasbg.fr/~bboett/
===============================================================

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