Openvas failure to login web

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GVM versions

**gsad:Greenbone Security Assistant 20.08.1~git-3cdd218c2-gsa-20.08(‘gsad --version’)
**gvmd:Greenbone Vulnerability Manager 20.08.1~git-df9da22ee-gvmd-20.08 (‘gvmd --version’)
openvas-scanner: (‘openvas --version’, in older GVM versions < 11: ‘openvassd --version’)
gvm-libs:

Environment

**Operating system:Ubuntu 20.4
**Kernel:Linux openvas 5.4.0-74-generic #83-Ubuntu SMP Sat May 8 02:35:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux (‘uname -a’)
Dear brothers,
I had installed successfull GVM 20.8 on Ubuntu 20.4 and I already completed scanning few months ago. Recently days, I intend conduct scanning on our enviroment but have problem with sign in Web GUI with error “The Greenbone Vulnerability Manager service is not responding. This could be due to system maintenance. Please try again later, check the system status, or contact your system administrator.” I tried restart service ( systemctl restart openvas) but not work. I tried to trace log on gvmd.log below:
md gmp:WARNING:2021-06-06 09h14.01 utc:445358: Authentication failure for ‘gmp’ from unix_socket
md gmp:WARNING:2021-06-06 09h14.01 utc:445371: Authentication failure for ‘gvmadmin’ from unix_socket
md gmp:WARNING:2021-06-06 09h14.01 utc:445377: Authentication failure for ‘omp’ from unix_socket
md gmp:WARNING:2021-06-06 09h14.01 utc:445383: Authentication failure for ‘observer’ from unix_socket
md gmp:WARNING:2021-06-06 09h14.01 utc:445387: Authentication failure for ‘webadmin’ from unix_socket
md main:MESSAGE:2021-06-06 14h46.16 utc:1218: Greenbone Vulnerability Manager version 20.08.1~git-df9da22ee-gvmd-20.08 (GIT revision df9da22ee-gvmd-20.08) (DB revision 233)
md manage:WARNING:2021-06-06 14h46.18 utc:1292: sql_open: PQconnectPoll failed
md manage:WARNING:2021-06-06 14h46.18 utc:1292: sql_open: PQerrorMessage (conn): FATAL: the database system is starting up
md manage:WARNING:2021-06-06 14h46.20 utc:1292: init_manage_process: sql_open failed

I also tail log on gsad.log
gsad gmp:WARNING:2021-06-06 14h59.52 utc:1283: Failed to connect to server at /opt/gvm/var/run/gvmd.sock: No such file or directory
gsad gmp:WARNING:2021-06-06 14h59.52 utc:1283: Authentication failure for ‘admin’ from 192.168.74.30. Status was 1.
Could you help me to troubleshoot this issue and resolve it?
Thanks so much and regards,