In my case eth0 has both an IPv4 and a global IPv6 address, but sysinfo doesn't report it:
root@ls1-lucid:~# ifconfig eth0
eth0 Link encap:Ethernet HWaddr f2:3c:91:96:7c:70
inet addr:xxx.xxx.xxx.xxx Bcast:xxx.xxx.xxx.xxx Mask:255.255.255.0
inet6 addr: yyyy:yyyy::yyyy:yyyy:yyyy:yyyy/64 Scope:Global
inet6 addr: fe80::f03c:91ff:fe96:7c70/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18831 errors:0 dropped:0 overruns:0 frame:0
TX packets:21597 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4069307 (4.0 MB) TX bytes:2384860 (2.3 MB)
Interrupt:28
root@ls1-lucid:~# landscape-sysinfo
System load: 0.11 Processes: 104
Usage of /: 30.6% of 3.94GB Users logged in: 1
Memory usage: 23% IP address for eth0: xxx.xxx.xxx.xxx
Swap usage: 0%
Graph this data and manage this system at https://landscape.canonical.com/
This bug has not seen any activity in the last 6 months, so it is being automatically closed.
If you are still experiencing this issue, please feel free to re-open.
Landscape Team