Oracle 11 com Ubuntu 11.10

Erro no startup : ORA-00845: MEMORY_TARGET not supported on this system

Alterei o arquivo init.ora para :
orcl.__db_cache_size=352321536
orcl.__java_pool_size=16777216
orcl.__large_pool_size=16777216
orcl.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=520093696
orcl.__sga_target=1006632960
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=587202560
orcl.__streams_pool_size=16777216
*.audit_file_dest='/u01/app/oracle/admin/orcl/adump'
*.audit_trail='db'
*.compatible='11.2.0.0.0'
*.control_files='/u01/app/oracle/oradata/orcl/control01.ctl','/u01/app/oracle/flash_recovery_area/orcl/control02.ctl'
*.db_block_size=8192
*.db_domain=''
*.db_name='orcl'
*.db_recovery_file_dest='/u01/app/oracle/flash_recovery_area'
*.db_recovery_file_dest_size=4070572032
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)'
#*.memory_target=1525678080
*.open_cursors=300
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.undo_tablespace='UNDOTBS1'

e iniciei o startup com : startup pfile="/u01/app/oracle/product/11.2.0/dbhome_2/dbs/init.ora"