Ubuntu – How to install Network-Manager after uninstalling it

I hope this has not been covered elsewhere already. It is rather specific an issue, and related to a computer-manufacturer, but I need help for something Ubuntu-related that should be no problem for you guys 🙂

So, I have this Ideacentre Q150, which seems to be an excellent option for just having a computer at home to surf and to do some editing. However, after installing Ubuntu over Win7, it only takes the Wireless Connection into account, and says there was no cable connected, but there is! And under Win7, the cable was recognized. I have tried this actually on 3 Ideacentres, Win7 works, and both Ubuntu 11.10 don't.

This german website suggests to download 2 packages (http://de.archive.ubuntu.com/ubuntu/pool/main/n/network-manager/network-manager_0.8-0ubuntu3_amd64.deb and http://de.archive.ubuntu.com/ubuntu/pool/main/n/network-manager-applet/network-manager-gnome_0.8-0ubuntu3_amd64.deb) and to

sudo apt-get remove --purge network-manager network-manager-gnome.

But somehow, the dependencies on the two files are not met, and without the network, and as it was a new install, I just reinstalled Ubuntu once more as it just such an easy thing to do.

I have searched through http://packages.ubuntu.com/oneiric/net/ and have found the 2 packages the user suggested, which I assume were more up to date(http://packages.ubuntu.com/oneiric/net/network-manager and http://packages.ubuntu.com/oneiric/net/network-manager-gnome), but for the formats, I am not sure which one would be best and easiest to install… .dsc, .tar.bz2, .tar.gz ?
And even then, what to do with the files? I found How do I install tar bz2 and gz files? but I am guessing Softwarecenter would be out of the question?

And lastly! If you know of any other ways that could work, I am all ears! 🙂

Thanks for any pointers!

ADDITION:

##@##:~$ cat /var/lib/NetworkManager/NetworkManager.state
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##@##:~$ cat /var/lib/NetworkManager/NetworkManager.state

[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##@##:~$ lspci -nnk | grep -i net
01:08.0 Ethernet controller [0200]: Intel Corporation 82552 10/100 Network Connection [8086:10fe] (rev 02)
##@##:~$ ifconfig -a
eth0      Link encap:Ethernet  HWaddr 38:60:77:71:b5:89  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 74:2f:68:28:00:a7  
          inet addr:192.168.178.66  Bcast:192.168.178.255  Mask:255.255.255.0
          inet6 addr: fe80::762f:68ff:fe28:a7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7477 errors:0 dropped:53 overruns:0 frame:0
          TX packets:5336 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:6669541 (6.6 MB)  TX bytes:1033545 (1.0 MB)

##@##:~$ dmesg | egrep 'eth0|e100|firm'
[    1.230481] e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
[    1.230490] e100: Copyright(c) 1999-2006 Intel Corporation
[    1.230616] e100 0000:01:08.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
[    1.258225] e100 0000:01:08.0: PME# disabled
[    1.259625] e100 0000:01:08.0: eth0: addr 0xfcfff000, irq 20, MAC addr 38:60:77:71:b5:89
[   17.468302] r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
##@##:~$ lsmod | grep e100
e100                   37213  0 
##@##:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

##@##:~$ ping -c 4 192.168.178.1
PING 192.168.178.1 (192.168.178.1) 56(84) bytes of data.
64 bytes from 192.168.178.1: icmp_req=1 ttl=64 time=1.20 ms
64 bytes from 192.168.178.1: icmp_req=2 ttl=64 time=1.20 ms
64 bytes from 192.168.178.1: icmp_req=3 ttl=64 time=1.14 ms
64 bytes from 192.168.178.1: icmp_req=4 ttl=64 time=1.24 ms

--- 192.168.178.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 1.142/1.197/1.247/0.050 ms

`

##@##:~$ sudo lshw -c network
[sudo] password for ##: 
  *-network DISABLED      
       description: Ethernet interface
       product: 82552 10/100 Network Connection
       vendor: Intel Corporation
       physical id: 8
       bus info: pci@0000:01:08.0
       logical name: eth0
       version: 02
       serial: 38:60:77:71:b5:89
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e100 driverversion=3.5.24-k2-NAPI duplex=full firmware=N/A latency=64 link=no maxlatency=56 mingnt=8 multicast=yes port=MII speed=100Mbit/s
       resources: irq:20 memory:fcfff000-fcffffff ioport:dc00(size=64)
  *-network
       description: Wireless interface
       physical id: 1
       bus info: usb@1:1
       logical name: wlan0
       serial: 74:2f:68:28:00:a7
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=r8712u ip=192.168.178.66 multicast=yes wireless=IEEE 802.11bg