oracle - Unable to Grant session to a user -

i used yesterday sqlplus on ubuntu 14.04lts today when open connect system :

sql> connect system enter password :  connected.

then want connect account created yesterday :

sql> connect slim/slimhmidi; connected.

when want create session had error:

sql> grant session slim; grant session slim       * error @ line 1: ora-01919: role ' session ' not exist

i tried create session no vain:

sql> grant create session slim; grant create session slim * error @ line 1:  ora-01031: insufficient privileges

also have error :

sql> grant connect slim; grant connect slim       *

error @ line 1: ora-01932: admin option not granted role ' connect' didn't have these problems yesterday.

ora-01919: role ' session ' not exist

you trying grant privilege user slim while connected slim. so, grantor , grantee same here.

ora-01932: admin option not granted role ' connect

as said, connected user slim, means user has connect privilege.

to grant create session user, sys user or other user has privilege grant.

update per op's comments

to give select privilege on table user:

grant select on table_name slim;

Unity