managed to start the vm but pve networking service is not running

[seaurchin]

when I was trying to start my first created vm, i faced the same issue as discussed in this thread https://forum.proxmox.com/threads/cant-start-vms.13824/

so I initially followed the thread and managed to created a bridge vmbr0 , I faced the problem because I created the pve install using vagrant.

I confirmed that vmbr0 does not exist using brctl command i.e

brctl show vmbr0

after confirming I followed the above linked thread and then tried after confirming I followed the above linked thread and then tried

 systemctl restart networking

this errored as shown below

# systemctl status networking
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2021-12-22 20:24:47 CET; 26min ago
     Docs: man:interfaces(5)
  Process: 27598 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
 Main PID: 27598 (code=exited, status=1/FAILURE)

Dec 22 20:24:46 pve systemd[1]: Starting Raise network interfaces...
Dec 22 20:24:47 pve ifup[27598]: RTNETLINK answers: File exists
Dec 22 20:24:47 pve ifup[27598]: ifup: failed to bring up eth1
Dec 22 20:24:47 pve systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Dec 22 20:24:47 pve systemd[1]: networking.service: Failed with result 'exit-code'.
Dec 22 20:24:47 pve systemd[1]: Failed to start Raise network interfaces.

but to my surprise I when I typed in

 ip addr show

the vmbr0 bridge was created.

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 08:00:27:a9:dc:1d brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 83498sec preferred_lft 83498sec
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 08:00:27:75:0c:1f brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.67/24 brd 192.168.1.255 scope global eth1
       valid_lft forever preferred_lft forever
7: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 08:00:27:a9:dc:1d brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.68/24 brd 192.168.1.255 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fea9:dc1d/64 scope link 
       valid_lft forever preferred_lft forever
8: tap999i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UNKNOWN group default qlen 1000
    link/ether 26:e0:7d:76:56:35 brd ff:ff:ff:ff:ff:ff

and I was able to start my vm using the command

sudo qm  start 999

but since in my pve installation the networking service is still not running, I tried reverting to original interfaces file shown below

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto vmbr0
iface vmbr0 inet manual

#VAGRANT-BEGIN
# The contents below are automatically generated by Vagrant. Do not modify.
auto eth1
iface eth1 inet static
      address 192.168.1.67
      netmask 255.255.255.0
#VAGRANT-END

but the networking service is still not starting please guide me how should I fix this what what is going wrong here !
thank you in advance