@hereabdulla try following and post your feedback
in your case custom username: vhrs / usually default username: frappe
sudo su - vhrs
cd /home/vhrs/bench-repo && git reset --hard && git pull
Then run bench update
Alway remember to run all commands not as root but as frappe or custom username you have chosen while installing bench and erpnext.
Caution: Running commands as root user will lead to various issues due to mixed up permissions.