You appear to have given your machine a name that won't resolve
public dns (.home doesn't exist), and that you haven't added to the
local machine lookups.
I am confused. The "home.3" domain is added by my 3g-to-wlan router
for sure via dhcp.
Could it be that dhclient was changed to set also the domain
distributed over dhcp, and this is the reason why this issue started
~1 month ago?
However, when I execute the hostname command, I get "user-pc.erdberg"
- where erdberg is the domain of another network I frequently use the
laptop (and also probably have installed it).
to the 127.0.0.1 and ::1 entry lines in your /etc/hosts file.
Thanks for the hint, I'll give it a try tomorrow.