Public bug reported:

# /etc/init.d/vtun status
● vtun.service - LSB: virtual tunnel over TCP/IP networks
     Loaded: loaded (/etc/init.d/vtun; generated)
     Active: failed (Result: timeout) since Tue 2020-12-15 18:29:43 EET; 28min 
ago
       Docs: man:systemd-sysv-generator(8)
      Tasks: 1 (limit: 18810)
     Memory: 2.8M
     CGroup: /system.slice/vtun.service
             └─164077 vtund[c]: vpn tun tun01

гру 15 18:57:20 myhost vtund[164077]: vpn tun tun01[164077]: Input/output error 
(5)
гру 15 18:57:20 myhost vtund[164077]: vpn tun tun01[164077]: Couldn't run down 
commands: fork() not available
гру 15 18:57:20 myhost vtund[164077]: vpn closing[164077]: Session 
vpn[server.vpn] closed
гру 15 18:57:25 myhost vtund[164077]: vpn connecting to server.vpn[164077]: 
Connecting to server.vpn
гру 15 18:57:25 myhost vtund[164077]: vpn connecting to server.vpn[164077]: Use 
SSL-aware challenge/response
гру 15 18:57:25 myhost vtund[164077]: vpn connecting to server.vpn[164077]: 
Remote Server sends <TuC1KE1>
                                          .
гру 15 18:57:25 myhost vtund[164077]: vpn connecting to server.vpn[164077]: 
Session vpn[server.vpn] opened
гру 15 18:57:25 myhost vtund[164077]: vpn connecting to server.vpn[164077]: 
Couldn't run up commands: fork() not available
гру 15 18:57:25 myhost vtund[164077]: vpn tun tun01[164077]: ZLIB 
compression[level 1] initialized.
гру 15 18:57:25 myhost vtund[164077]: vpn tun tun01[164077]: Blowfish-128-ECB 
encryption initialized


# ifconfig tun01
tun01: flags=4240<POINTOPOINT,NOARP,MULTICAST>  mtu 1500
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 500  
(UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

** Affects: vtun (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1908285

Title:
  vtun is not working after upgrade to 20.04

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