Question

14.04 installed. Wifi error. Help me plz with new installation. Dell I5-4200u. Certified is 14.04 / maybe 12. Thz.

Answer 1

please let me see.

open terminal / ctrl+alt+t

 lspci | grep -i wireless

i will find your driver

Comments

please let me see.

open terminal / ctrl+alt+t

 lspci | grep -i wireless

i will find your driver

other releate link

https://askubuntu.com/questions/1034229/intel-dual-band-wireless-ac-7260-issues-in-ubuntu-18-04

https://askubuntu.com/questions/645506/what-driver-for-intel-ac-7260-adapter

https://www.intel.com/content/www/us/en/support/articles/000005511/network-and-i-o/wireless-networking.html

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Terminal outputs,
03:00.0 Network controller: Intel corporation wireless 7260 (rev 6b).

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please test
download and install
wget -O linux-firmware_1.142.deb http://people.canonical.com/~sforshee/lp1354975/linux-firmware_1.142~lp1354975v201502191014/linux-firmware_1.142~lp1354975v201502191014_all.deb
sudo dpkg -i linux-firmware_1.142.deb

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https://askubuntu.com/questions/616119/unstable-wireless-with-intel-7260-iwlwifi-after-upgrade-to-15-04

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Thank you, Bro! I'll try to fix.