Ubuntu Oracle ORA-01031: insufficient privileges

1: Enter slqplus sytem/password as sysdba In the Ubuntu terminal to report the following error:

ORA-01031: insufficient privileges, found on google

ORA-01031: insufficient privileges
After the Oracle installation is complete, the system has an ora_dba group, and the users logged on to the system are no longer in this group. Therefore, the above problems are caused.
Solution: Add db2admin to the ora_dba group.

This friend posted a post, but it was not clear. But you still need to understand what this friend means.

2: add the following to my friend: "After oracle is installed, the system has an ora_dba group". You should change it to a dba group after oracle is installed,

Of course, you can use groups oracle on the terminal to view the real group name of the oracle user, and then add the current system user to the group where the oracle user is located. For example, sudo gpasswd-a username dba

3: Enter sqlplus system/miles123 as sysdba again

4: output:

SQL * Plus: Release 10.2.0.1.0-Production on Thu Jun 3 09:51:18 2010

Copyright (c) 1982,200 5, Oracle. All rights reserved.

Connected to an idle instance.