(on ipv4 only)RTNETLINK answers: Permission denied .FATA[0002] Add route failed:

[lovitus]

>>(base) root@ovmAmdBrick:/tmp# cat /proc/sys/net/ipv6/conf/all/disable_ipv6 
1
>>(base) root@ovmAmdBrick:/tmp# sc
INFO[0002] Found 1. Galaxy S20 FE 5G (192.168.15.223)   
INFO[0002] Selected Galaxy S20 FE 5G (192.168.15.223)   
INFO[0002] SOCKS port: 10808                            
INFO[0002] DNS port: 6450                               
INFO[0002] Enable log: false                            
RTNETLINK answers: Permission denied
FATA[0002] Add route failed: ip addr add fdfe:dcba:9876::1/126 dev tun0: exit status 2 

>>uname -a
Linux ovmAmdBrick 5.10.0-0.bpo.3-amd64 #1 SMP Debian 5.10.13-1~bpo10+1 (2021-02-11) x86_64 GNU/Linux

>>(base) root@ovmAmdBrick:/tmp# route  -6
Kernel IPv6 routing table
Destination                    Next Hop                   Flag Met Ref Use If
[::]/0                         [::]                       !n   -1  1     0 lo
[::]/0                         [::]                       !n   -1  1     0 lo

with ipv6

echo '0' >  /proc/sys/net/ipv6/conf/all/disable_ipv6 

it's working well.