I have installed Oracle 11g R2 on ubuntu 14.04 LTS. On terminal I wrote following to start oracle:
sudo service oracle-xe start
on pressing enter, got following output :
" Starting Oracle Net Listener. touch: cannot touch '/var/lock/subsys/listener' : No such file or directory Starting Oracle Database 11g Express Edition instance. Failed to start Oracle Net Listener using /u01/app/oracle/product/11.2.0/xe/bin/tnslsnr and Oracle Express Database using /u01/app/oracle/product/11.2.0/xe/bin/sqlplus. "
What should I do now.