if you’re using ubuntu 16.04, I recommand your upgrade your system to ubuntu1804.

install 1080TI driver for ubuntu1804

1.Remove old Nvidia driver
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sudo apt-get purge nvidia*
2. add a repository
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sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
3. Installation

Type in this command, then press Tab, I install nividia-driver-435.

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sudo apt-get install nividia-

or try this command

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sudo ubuntu-drivers autoinstall

then reboot

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reboot

Last

when I try to install deb file, there’s some wrong in it.

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sudo apt-get install -f

then run command

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sudo dpkg - i *.deb
install deb
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1.CODE:

sudo apt-get install rpm alien

2.CODE:

alien -d package.rpm

3.CODE:

sudo dpkg -i package.deb