leyba@leyba-kubuntu-amd64:~$ grep firebird /etc/group
firebird:x:84:leyba
leyba@leyba-kubuntu-amd64:~$ sudo chown -R firebird:firebird /home/leyba/laz_proj/leybasoft_arm_v5/dbase/
[sudo] password for leyba: 
leyba@leyba-kubuntu-amd64:~$ isql
Use CONNECT or CREATE DATABASE to specify a database
SQL> connect '127.0.0.1:/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB' user SYSDBA password 'cooladmin';
Statement failed, SQLSTATE = 08001
I/O error during "open" operation for file "/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB"
-Error while trying to open file
-Permission denied
SQL> connect '/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB' user SYSDBA password '1';
Database: '/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB', User: SYSDBA
SQL> show db;
Database: /home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB
        Owner: SYSDBA                         
PAGE_SIZE 16384
Number of DB pages allocated = 674
Number of DB pages used = 598
Number of DB pages free = 76
Sweep interval = 20000
Forced Writes are ON
Transaction - oldest = 3807
Transaction - oldest active = 3808
Transaction - oldest snapshot = 3808
Transaction - Next = 3812
ODS = 12.0
Database not encrypted
Creation date: Apr 12, 2022 11:54:49
Default Character set: UTF8
SQL>

leyba@leyba-kubuntu-amd64:~$ sudo chmod -R 777 /home/leyba/laz_proj/leybasoft_arm_v5/dbase/
leyba@leyba-kubuntu-amd64:~$ isql
Use CONNECT or CREATE DATABASE to specify a database
SQL> connect '127.0.0.1:/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB' user SYSDBA password 'cooladmin';
Statement failed, SQLSTATE = 08001
I/O error during "open" operation for file "/home/leyba/laz_proj/leybasoft_arm_v5/dbase/ARMDOC_5_0_148.FDB"
-Error while trying to open file
-Permission denied
SQL>