ORA-28001：パスワードの有効期限が切れています。修正できません。

Oracle DB（Oracle-XEのSAMPLEでも機能するはずです）がUnix、ssh-in、および：

sqlplus /nolog

SQL> connect / as SYSDBA
Connected.

SQL> SELECT username, account_status FROM dba_users WHERE ACCOUNT_STATUS LIKE '%EXPIRED%';
# ... your locked account should be listed ...

SQL> ALTER USER sample IDENTIFIED BY sample;         
User altered.

SQL> ALTER USER sample ACCOUNT UNLOCK;
User altered.

SQL> ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
Profile altered.

SQL> exit