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Hi I m having win xp and ubuntu 11.04 dual boot...
I had changed the ip config setting from 'detect automatically' to manual in win xp and i encountered a problem that it failed to connect to the network in ubuntu.. Later i tried editing the Autoeth0 settings by feeding the manual ip info..nd now it says connection established but still i couldnt access the net through firefox...

I tried to change the info in the conf file in etc/Networkmanager but it doesnt allow me.. it treats it as read only file.. Pl help me out...

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Follow-up note (from ’s later post): the problem was DNS — the interface came up but name resolution was missing. A network that looks “connected” but won’t load web pages most often has working L2/L3 but no DNS or no default route. The short checklist below helps isolate the cause and shows safe, persistent ways to fix DNS on Ubuntu 11.04.

Quick diagnostics (run as root or with sudo):

sudo ifconfig eth0
route -n
ping -c 3 8.8.8.8        # tests IP-level connectivity (no DNS)
ping -c 3 google.com     # tests DNS resolution
cat /etc/resolv.conf
sudo service network-manager restart

If ping to 8.8.8.8 succeeds but hostnames fail, DNS is the culprit. Avoid editing /etc/resolv.conf directly — NetworkManager/resolvconf usually overwrites it. Persistent options on Ubuntu 11.04: set the DNS in the NetworkManager GUI or with nm-connection-editor, or add entries to resolvconf by editing /etc/resolvconf/resolv.conf.d/base and running sudo resolvconf -u. Connection profiles live in /etc/NetworkManager/system-connections/; those files can be edited (as root) and must keep secure permissions.

Notes and cautions: system files require root — use sudo or a graphical gksudo/gksu editor. Back up any file before editing. If the file appears read-only even with sudo, check whether the root filesystem is mounted read-only (booted into recovery or a live environment). If Firefox still fails while command-line lookups work, check browser proxy settings and any local firewall rules.

Member Avatar for venktech

I forgot to update the DNS server config.. I added it.. nw it works fine..:)

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