The issue seems not to be directly related to Network-Manager but rather
to the RP-PPPoE plugin.

I uninstalled Network-Manager, installed Wicd instead, and issued the
"sudo pon dsl-provider" command; I am connected now and the connection
appears to be stable up to now (about 7 hours total connection time).

I remember I had to install something (probably the equivalent plugin)
when setting up Ubuntu (Gutsy) on my computer for the first time but I
didn't had to do it again after upgrading to Hardy or Intrepid. Also I
must now use the command each time I startup my computer; what should I
do to make it be loaded automatically at startup ?

Also, I don't think Wicd is actually working it always indicates "Not
connected" in its stauts bar.


Updated additionnal information:

sudo lshw -C network
  *-network               
       description: Ethernet interface
       product: 3c940 10/100/1000Base-T [Marvell]
       vendor: 3Com Corporation
       physical id: 5
       bus info: p...@0000:02:05.0
       logical name: eth1
       version: 12
       serial: 00:0c:6e:40:4c:04
       size: 10MB/s
       capacity: 1GB/s
       width: 32 bits
       clock: 66MHz
       capabilities: pm vpd bus_master cap_list ethernet physical tp 10bt 
10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=skge 
driverversion=1.13 duplex=half firmware=N/A latency=64 link=yes maxlatency=31 
mingnt=23 module=skge multicast=yes port=twisted pair speed=10MB/s
  *-network DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: pan0
       serial: 72:84:05:c0:75:4a
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 
firmware=N/A link=yes multicast=yes


ifconfig
eth1      Link encap:Ethernet  HWaddr 00:0c:6e:40:4c:04  
          inet6 addr: fe80::20c:6eff:fe40:4c04/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:24885 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21057 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:28856170 (28.8 MB)  TX bytes:5761864 (5.7 MB)
          Interrupt:22 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:404 errors:0 dropped:0 overruns:0 frame:0
          TX packets:404 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:32272 (32.2 KB)  TX bytes:32272 (32.2 KB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:81.247.69.102  P-t-P:81.247.69.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:24516 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20683 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:28195065 (28.1 MB)  TX bytes:5200001 (5.2 MB)


dmesg | grep eth
[    1.743053] Driver 'sd' needs updating - please use bus_type methods
[    1.743069] Driver 'sr' needs updating - please use bus_type methods
[    3.824887] skge eth0: addr 00:0c:6e:40:4c:04
[    9.896755] udev: renamed network interface eth0 to eth1
[   29.200468] skge eth1: enabling interface
[   29.204556] ADDRCONF(NETDEV_UP): eth1: link is not ready
[   31.467419] skge eth1: Link is up at 10 Mbps, half duplex, flow control none
[   31.467592] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[   41.496008] eth1: no IPv6 routers present


cat /etc/network/interfaces
auto lo
iface lo inet loopback


cat /etc/NetworkManager/nm-system-settings.conf
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

-- 
Wired Network Disconnected after upgrade from Intrepid to Jaunty
https://bugs.launchpad.net/bugs/368709
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