[pkg-lxc-devel] Bug#899228: lxc 2.0.07-2 - unknown key lxc.idmap

[ѽ҉ᶬḳ℠]

Package: lxc
Version: 2.0.7-2+deb9u2
Linux server 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07)
x86_64 GNU/Linux
libc 2.24-11+deb9u3
uidmap 4.4-4.1

trying to run an unprivileged container produces

     "lxc-start: confile.c: parse_line: 2008 unknown key lxc.idmap
     lxc-start: parse.c: lxc_file_for_each_line: 57 Failed to parse 
config: lxc.idmap = u 0 100000 65536
     lxc-start: tools/lxc_start.c: main: 284 Failed to create lxc_container"

The container config containing

"lxc.idmap = u 0 100000 65536
lxc.idmap = g 0 100000 65536"

output from grep root /etc/sub* 2>/dev/null

     "/etc/subgid:root:100000:65536
     /etc/subuid:root:100000:65536"