I have installed Elasticsearch- 7.11.2 in Ubuntu 18.04 machine.
when trying to start the Elasticsearch service getting below error:

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root@extramarks -Latitude- 3400:/etc/ elasticsearch# systemctl status elasticsearch. service
Display all 571 possibilities? (y or n)
root@extramarks -Latitude- 3400:/etc/ elasticsearch# systemctl status elasticsearch. service
● elasticsearch. service - Elasticsearch
Loaded: loaded (/usr/lib/ systemd/ system/ elasticsearch. service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: https:/ /www.elastic. co
root@extramarks -Latitude- 3400:/etc/ elasticsearch# systemctl start elasticsearch. service

Job for elasticsearch. service failed because the control process exited with error code.
See "systemctl status elasticsearch. service" and "journalctl -xe" for details.
root@extramarks -Latitude- 3400:/etc/ elasticsearch#
root@extramarks -Latitude- 3400:/etc/ elasticsearch#
root@extramarks -Latitude- 3400:/etc/ elasticsearch#
root@extramarks -Latitude- 3400:/etc/ elasticsearch# journalctl -xe
Mar 25 11:44:19 extramarks- Latitude- 3400 /usr/lib/ gdm3/gdm- x-session[ 3423]: (II) event17 - DELL08BC:00 04F3:30CA Touchpad: SYN_DROPPED event -
Mar 25 11:44:19 extramarks- Latitude- 3400 /usr/lib/ gdm3/gdm- x-session[ 3423]: (EE) client bug: timer event17 tap: offset negative (-881ms)
Mar 25 11:45:01 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: Exception in thread "main" org.elasticsear ch.bootstrap. BootstrapExcept ion:
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: Likely root cause: java.nio. file.AccessDeni edException: /etc/elasticsearch
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ sun.nio. fs.UnixExceptio n.translateToIO Exception( UnixE
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ sun.nio. fs.UnixExceptio n.rethrowAsIOEx ception( UnixExc
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ sun.nio. fs.UnixExceptio n.rethrowAsIOEx ception( UnixExc
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ sun.nio. fs.UnixFileSyst emProvider. newByteChannel( Unix
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ java.nio. file.spi. FileSystemProvi der.newOutputSt ream(
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at java.base/ java.nio. file.Files. newOutputStream (Files. java:224)
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.apache. lucene. store.FSDirecto ry$FSIndexOutpu t.<init> (FSDire
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.apache. lucene. store.FSDirecto ry$FSIndexOutpu t.<init> (FSDire
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.apache. lucene. store.FSDirecto ry.createOutput (FSDirectory. ja
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.common. settings. KeyStoreWrapper .save(KeyStore
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Bootstrap. loadSecureSetti ngs(Bootst
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Bootstrap. loadSecureSetti ngs(Bootst
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Bootstrap. init(Bootstrap. java:342)
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Elasticsearch. init(Elasticsea rch.ja
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Elasticsearch. execute( Elasticsearch
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.cli. EnvironmentAwar eCommand. execute( Environme
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.cli. Command. mainWithoutErro rHandling( Command.
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.cli. Command. main(Command. java:79)
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Elasticsearch. main(Elasticsea rch.ja
Mar 25 11:45:02 extramarks- Latitude- 3400 systemd- entrypoint[ 15473]: at org.elasticsear ch.bootstrap. Elasticsearch. main(Elasticsea rch.ja
Mar 25 11:45:01 extramarks- Latitude- 3400 systemd[1]: elasticsearch. service: Main process exited, code=exited, status=1/FAILURE
Mar 25 11:45:02 extramarks- Latitude- 3400 CRON[15692]: pam_unix( cron:session) : session opened for user root by (uid=0)
Mar 25 11:45:01 extramarks- Latitude- 3400 systemd[1]: elasticsearch. service: Failed with result 'exit-code'.
Mar 25 11:45:02 extramarks- Latitude- 3400 CRON[15695]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Mar 25 11:45:01 extramarks- Latitude- 3400 systemd[1]: Failed to start Elasticsearch.
-- Subject: Unit elasticsearch. service has failed
-- Defined-By: systemd
-- Support: http:// www.ubuntu. com/support
-- Unit elasticsearch. service has failed.
-- The result is RESULT.
Mar 25 11:45:03 extramarks- Latitude- 3400 CRON[15692]: pam_unix( cron:session) : session closed for user root
root@extramarks -Latitude- 3400:/etc/ elasticsearch#
root@extramarks -Latitude- 3400:/etc/ elasticsearch# exit
logout
(base) extramarks@ extramarks- Latitude- 3400:~$
(base) extramarks@ extramarks- Latitude- 3400:~$ sudo systemctl start elasticsearch. service
Job for elasticsearch. service failed because the control process exited with error code.
See "systemctl status elasticsearch. service" and "journalctl -xe" for details.

Please find below my system information:

(base) extramarks@ extramarks- Latitude- 3400:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04 LTS
Release: 18.04
Codename: bionic

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(base) extramarks@ extramarks- Latitude- 3400:~$ uname -a
Linux extramarks- Latitude- 3400 5.4.0-70-generic #78~18.04.1-Ubuntu SMP Sat Mar 20 14:10:07 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

KIndly help me with this.