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>

leyba@leyba-kubuntu-amd64:~$ isql
Use CONNECT or CREATE DATABASE to specify a database
SQL> connect 'localhost:/opt/firebird/help/help.fdb' user sysdba password 'cooladmin';'
Database: 'localhost:/opt/firebird/help/help.fdb', User: SYSDBA
CON> 

leyba@leyba-kubuntu-amd64:/opt/firebird$ ls -l
total 2172
...
drwxr-xr-x  2 root     root        4096 июн  7 11:50 help
...

leyba@leyba-kubuntu-amd64:/opt/firebird/help$ ls -l
total 1056
-r--r--r-- 1 root root 1081344 июн  7 11:50 help.fdb

leyba@leyba-kubuntu-amd64:~/laz_proj/leybasoft_arm_v5$ ls -l
total 2476
...
drwsrwsrwx+ 2 firebird firebird   4096 июл 16 00:24 dbase
...

leyba@leyba-kubuntu-amd64:~/laz_proj/leybasoft_arm_v5/dbase$ ls -l
total 36860
-rwxrwxrwx 1 firebird firebird 10436608 июл 16 00:24 ARMDOC_5000_UNICODE_FB3.FDB
-rwxrwxrwx 1 firebird firebird 11042816 июл 17 17:30 ARMDOC_5_0_148.FDB
-rwxrwxrwx 1 firebird firebird 18972672 июл 17 22:17 PHONES.FDB

leyba@leyba-kubuntu-amd64:~$ pstree
systemd─┬─ModemManager───2*[{ModemManager}]
        <skiped>
        ├─dbus-daemon
        ├─fbguard───firebird───2*[{firebird}]
        ├─haveged
        <skiped>

leyba-kubuntu-amd64	Sun Jul 17 22:08:32 2022
	/opt/firebird/bin/fbguard: guardian starting /opt/firebird/bin/firebird
leyba-kubuntu-amd64	Sun Jul 17 22:18:34 2022
	/opt/firebird/bin/fbguard: /opt/firebird/bin/firebird terminated
leyba-kubuntu-amd64	Mon Jul 18 21:17:48 2022
	/opt/firebird/bin/fbguard: guardian starting /opt/firebird/bin/firebird
leyba-kubuntu-amd64	Mon Jul 18 21:17:49 2022
	setsockopt: error setting IPV6_V6ONLY to 0
leyba-kubuntu-amd64	Mon Jul 18 22:29:08 2022
	/opt/firebird/bin/fbguard: /opt/firebird/bin/firebird terminated
leyba-kubuntu-amd64	Tue Jul 19 13:47:33 2022
	/opt/firebird/bin/fbguard: guardian starting /opt/firebird/bin/firebird
leyba-kubuntu-amd64	Tue Jul 19 13:47:34 2022
	setsockopt: error setting IPV6_V6ONLY to 0

# Allows setting of IPV6_V6ONLY socket option. If enabled, IPv6 sockets
# allow only IPv6 communication and separate sockets must be used for
# IPv4 and IPv6. Default is false.
#
# Note: on Windows, the socket option can only be set since Windows Vista,
# older versions have it always enabled.
#
# Type: boolean
#
#IPv6V6Only = 0