On 5 Apr 2016, at 06:42, Thomas Schneider <c.mo...@web.de> wrote:

> This is the output:
> root@vm103-db:~# ip -f inet6 addr show
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 9: eth0@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>     inet6 fe80::3065:65ff:fe39:3035/64 scope link
>        valid_lft forever preferred_lft forever
> root@vm103-db:~# ip -f inet6 route show
> fe80::/64 dev eth0  proto kernel  metric 256 
> root@vm103-db:~# ip -f inet6 neigh show
> root@vm103-db:~# 

Indeed it does.
I think you may be seeing a known bug (that's 3 1/2 years old) :
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684407

It's off topic for this list, I suggest you go and enquire of the maintainers 
since apt is definitely not acting correctly here.

There is a message there that apt will try the first address, and if a 
connection fails then it'll try the other addresses in turn. This would explain 
why it downloads some packages (connects OK via IPv4) but then fails - if a 
connection fails over IPv4 then it'll cycle round and try an IPv6 address - and 
then it reports a misleading error* when that fails. It should not, IMO, be 
trying IPv6 addresses if the system isn't configured with routable addresses.

* The error should really be "couldn't connect to any address" rather than 
"couldn't connect to ${last_address_tried}".


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