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[Bug 1590217] [NEW] [Xenial] 0.9.1~fan1 from ppa:apw/fan-staging fanatic fails if lxd not installed

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Public bug reported:

I was testing fanatic from apw's fan-staging ppa:

ubuntu-fan:
  Installed: 0.9.1~fan1
  Candidate: 0.9.1~fan1
  Version table:
 *** 0.9.1~fan1 0
        500 http://ppa.launchpad.net/apw/fan-staging/ubuntu/ xenial/main amd64 Packages
        100 /var/lib/dpkg/status
     0.9.0 0
        500 http://us.archive.ubuntu.com/ubuntu/ xenial/main amd64 Packages

I didn't have lxd installed when running fanatic and get the following
error:

$ sudo fanatic
Welcome to the fanatic fan networking wizard.  This will help you set
up an example fan network and optionally configure docker and/or LXD to
use this network.  See fanatic(1) for more details.

Configure fan underlay (hit return to accept, or specify alternative) [192.168.0.0/16]:
Configure fan overlay (hit return to accept, or specify alternative) [250.0.0.0/8]:
vxlan: unknown command "fan-map"?
Usage: ... vxlan id VNI [ { group | remote } ADDR ] [ local ADDR ]
                 [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]
                 [ dstport PORT ] [ srcport MIN MAX ]
                 [ [no]learning ] [ [no]proxy ] [ [no]rsc ]
                 [ [no]l2miss ] [ [no]l3miss ]
                 [ ageing SECONDS ] [ maxaddress NUMBER ]
                 [ [no]udpcsum ] [ [no]udp6zerocsumtx ] [ [no]udp6zerocsumrx ]
                 [ gbp ]

Where: VNI := 0-16777215
       ADDR := { IP_ADDRESS | any }
       TOS  := { NUMBER | inherit }
       TTL  := { 1..255 | inherit }
/usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev enp0s25 dstport 0 local 192.168.1.16 fan-map 250.0.0.0/8:192.168.0.0/16
/usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
RTNETLINK answers: Cannot assign requested address
iptables: Bad rule (does a matching rule exist in that chain?).
rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
Cannot find device "ftun0"
/usr/sbin/fanctl: ip link set dev ftun0 up
/usr/sbin/fanctl: WARNING: ftun0: failed to up interface
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: No chain/target/match by that name.
rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
interface ftun0 does not exist!
/usr/sbin/fanctl: brctl addif fan-250 ftun0
/usr/sbin/fanctl: WARNING: ftun0: failed to add vxlan interface to bridge
Cannot find device "ftun0"
Cannot find device "ftun0"
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: No chain/target/match by that name.
rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
Cannot find device "fan-250"
/usr/sbin/fanctl: ip addr add 250.1.16.1/8 dev fan-250
/usr/sbin/fanctl: WARNING: fan-250: failed to add 250.1.16.1/8 address
iptables: Too many links.
Cannot find device "fan-250"
/usr/sbin/fanctl: ip link set dev fan-250 up
/usr/sbin/fanctl: WARNING: fan-250: failed to bring interface up
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: Too many links.
rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
dnsmasq: failed to create listening socket for 250.1.16.1: Cannot assign requested address
/usr/sbin/fanctl: dnsmasq -u dnsmasq --strict-order --bind-interfaces --pid-file=/run/ubuntu-fan/dnsmasq-fan-250.pid --conf-file= --listen-address 250.1.16.1 --dhcp-range 250.1.16.2,250.1.16.254 --dhcp-no-override --except-interface=lo --interface=fan-250 --dhcp-leasefile=/var/lib/misc/dnsmasq.fan-250.leases --dhcp-authoritative
/usr/sbin/fanctl: WARNING: fan-250: failed to start dnsmasq
iptables: Bad rule (does a matching rule exist in that chain?).
iptables: Too many links.
rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
/usr/sbin/fanctl: /etc/network/fan:22 192.168.0.0/16 250.0.0.0/8  -- failed err=1
LXD not installed, unable to configure

** Affects: ubuntu-fan (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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https://bugs.launchpad.net/bugs/1590217

Title:
  [Xenial] 0.9.1~fan1 from ppa:apw/fan-staging fanatic fails if lxd not
  installed

Status in ubuntu-fan package in Ubuntu:
  New

Bug description:
  I was testing fanatic from apw's fan-staging ppa:

  ubuntu-fan:
    Installed: 0.9.1~fan1
    Candidate: 0.9.1~fan1
    Version table:
   *** 0.9.1~fan1 0
          500 http://ppa.launchpad.net/apw/fan-staging/ubuntu/ xenial/main amd64 Packages
          100 /var/lib/dpkg/status
       0.9.0 0
          500 http://us.archive.ubuntu.com/ubuntu/ xenial/main amd64 Packages

  I didn't have lxd installed when running fanatic and get the following
  error:

  $ sudo fanatic
  Welcome to the fanatic fan networking wizard.  This will help you set
  up an example fan network and optionally configure docker and/or LXD to
  use this network.  See fanatic(1) for more details.

  Configure fan underlay (hit return to accept, or specify alternative) [192.168.0.0/16]:
  Configure fan overlay (hit return to accept, or specify alternative) [250.0.0.0/8]:
  vxlan: unknown command "fan-map"?
  Usage: ... vxlan id VNI [ { group | remote } ADDR ] [ local ADDR ]
                   [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]
                   [ dstport PORT ] [ srcport MIN MAX ]
                   [ [no]learning ] [ [no]proxy ] [ [no]rsc ]
                   [ [no]l2miss ] [ [no]l3miss ]
                   [ ageing SECONDS ] [ maxaddress NUMBER ]
                   [ [no]udpcsum ] [ [no]udp6zerocsumtx ] [ [no]udp6zerocsumrx ]
                   [ gbp ]

  Where: VNI := 0-16777215
         ADDR := { IP_ADDRESS | any }
         TOS  := { NUMBER | inherit }
         TTL  := { 1..255 | inherit }
  /usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev enp0s25 dstport 0 local 192.168.1.16 fan-map 250.0.0.0/8:192.168.0.0/16
  /usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
  RTNETLINK answers: Cannot assign requested address
  iptables: Bad rule (does a matching rule exist in that chain?).
  rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
  Cannot find device "ftun0"
  /usr/sbin/fanctl: ip link set dev ftun0 up
  /usr/sbin/fanctl: WARNING: ftun0: failed to up interface
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: No chain/target/match by that name.
  rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
  interface ftun0 does not exist!
  /usr/sbin/fanctl: brctl addif fan-250 ftun0
  /usr/sbin/fanctl: WARNING: ftun0: failed to add vxlan interface to bridge
  Cannot find device "ftun0"
  Cannot find device "ftun0"
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: No chain/target/match by that name.
  rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
  Cannot find device "fan-250"
  /usr/sbin/fanctl: ip addr add 250.1.16.1/8 dev fan-250
  /usr/sbin/fanctl: WARNING: fan-250: failed to add 250.1.16.1/8 address
  iptables: Too many links.
  Cannot find device "fan-250"
  /usr/sbin/fanctl: ip link set dev fan-250 up
  /usr/sbin/fanctl: WARNING: fan-250: failed to bring interface up
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: Too many links.
  rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
  dnsmasq: failed to create listening socket for 250.1.16.1: Cannot assign requested address
  /usr/sbin/fanctl: dnsmasq -u dnsmasq --strict-order --bind-interfaces --pid-file=/run/ubuntu-fan/dnsmasq-fan-250.pid --conf-file= --listen-address 250.1.16.1 --dhcp-range 250.1.16.2,250.1.16.254 --dhcp-no-override --except-interface=lo --interface=fan-250 --dhcp-leasefile=/var/lib/misc/dnsmasq.fan-250.leases --dhcp-authoritative
  /usr/sbin/fanctl: WARNING: fan-250: failed to start dnsmasq
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: Too many links.
  rm: cannot remove ‘/run/ubuntu-fan/nat-core’: No such file or directory
  /usr/sbin/fanctl: /etc/network/fan:22 192.168.0.0/16 250.0.0.0/8  -- failed err=1
  LXD not installed, unable to configure

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