nvidia graphics driver failing to activate - proxy

[garda]

Try refreshing the package and repositories informations either by pressing CTRL+R in Synaptic or by entering this command in Terminal:

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apt update

Then try to install the restricted drivers again. Restricted graphics drivers are not mandatory to making a usable Linux system, by the way. They are only needed for 3D acceleration and compositing effects.

[garda]

That error message pops up if you execute apt commands in Terminal while Synaptic is running. So close Synaptic then execute the above command again and try to install nvidia restricted driver again. If it still will not install, post the error message here.

[garda]

Edit:
You can also try this (make sure Synaptic is not running before proceeding):

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sudo su

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cd /var/lib/apt/lists/

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mv lock lock.old

[garda]

Execute this command in Terminal then run apt update again:

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export http_proxy=http://username:password@proxy:port

Of course, you have to replace everything after http:// with the necessary values.

[garda]

Enter this command in Terminal:

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ps aux | grep apt

You will get something like this:

garda 15104 0.0 0.0 1860 496 ? Ss 16:10 0:00 /bin/sh -c gksu synaptic
garda 15105 0.1 0.5 15556 6080 ? S 16:10 0:00 gksu synaptic
root 15118 32.0 2.7 65916 28872 ? Rs 16:10 0:14 synaptic
garda 17276 0.0 0.0 3132 764 pts/0 R+ 16:11 0:00 grep --colour=auto apt

Note the number in bold above, that is the pid of Synaptic. Add it to a kill command to close Synaptic by force:

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sudo kill 15118

If Synaptic is not listed in the output of the first command, you may want to proceed with the instructions I posted earlier:

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sudo su

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cd /var/lib/apt/lists/

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mv lock lock.old

Still not working? Try this one:

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sudo apt-get clean

[garda]

I just tried to do an apt-get update but I did not get 404 (not found) error. So either there is something wrong with your proxy or you have not correctly setup the proxy information.

Have you entered your proxy informations, either by executing the 'export' command in one of my earlier posts or by adding them in Synaptic > Preferences > Network tab?