Public bug reported:

On starting an openconnect session, I get error messages that appear to
be caused by interactions with /sbin/ip:

    sudo openconnect --syslog --deflate --disable-ipv6 \
      "--authgroup=$AUTHGRP" "--user=$USERNAM" "$VPN_URL"

    Please enter your username and password.
    Password:
    Error: any valid prefix is expected rather than "dev".
    Error: ipv4: Invalid values in header for route get request.
    Usage: ip route { list | flush } SELECTOR
           ip route save SELECTOR
           ip route restore
           ip route showdump
           ip route get [ ROUTE_GET_FLAGS ] ADDRESS
                                [ from ADDRESS iif STRING ]
                                [ oif STRING ] [ tos TOS ]
                                [ mark NUMBER ] [ vrf NAME ]
                                [ uid NUMBER ] [ ipproto PROTOCOL ]
                                [ sport NUMBER ] [ dport NUMBER ]
           ip route { add | del | change | append | replace } ROUTE

Maybe the output format of /sbin/ip changed since openconnect was last
updated?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: openconnect 8.05-1
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Tue May  5 13:57:58 2020
InstallationDate: Installed on 2016-06-05 (1430 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: openconnect
UpgradeStatus: Upgraded to focal on 2020-04-25 (9 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2018-03-20T22:16:27.108498

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1876968

Title:
  Error "Usage: ip route { list | flush } SELECTOR"

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