[rudra]

...
Has ip6tables: pass
....
Has /proc/net/dev: pass
Has /proc/net/if_inet6: pass
... ...
== IPv6 ==
Creating 'ufw-check-requirements6'... done
Inserting RETURN at top of 'ufw-check-requirements6'... done
TCP: pass
UDP: pass
...
...
ipv6 rt: pass

All tests passed


so these are from his requirement test. nothing missings to run ipv6 part successfully.

so i wonder what this ipv6 disable is going to do though.

it is most probably module load errors. those are referred in the following files..

/etc/ufw/before.rules
/etc/ufw/before6.rules
/etc/ufw/after.rules
/etc/ufw/after6.rules

so you may check what's in them.

ADDITIONAL..
please run
sudo /lib/ufw/ufw-init start
or if it is already running, then
sudo /lib/ufw/ufw-init force-reload

and share the output of anything new in it.

then you may run the following commands to just get a fresh ufw

apt-get purge ufw -y --force-yes

apt-get update; apt-get upgrade -y --force-yes

apt-get install ufw
## from ubuntuforum


also please run 'strace' on the enable command for us.

thanks