In 14.04 and 14.10 versions there is such problem in some devices. The solution can be different. But in 99% cases
the problem appears due to one of these two reasons: wpa_suplicant bug, wifi sleep bug.
Let’s go:
1. Try to restart network manager via terminal:
1 | sudo restart network-manager |
If it helps and after this command wifi started working, then add this command to autorun file. Run this command:
1 | sudo gedit /etc/pm/sleep.d |
In editor window paste this:
1 2 3 4 | case "${1}" in resume|thaw) service network-manager restart;;esac |
2. May be it is wpa_suplicant problem. Run this command
1 | sudo pkill -f wpa_supplicant |
If it helps, then add this to autorun file:
1 | sudo gedit /etc/pm/wpa_supplicant |
In editor window paste this:
1 2 3 4 5 6 | #!/bin/shcase "$1" in resume) killall wpa_supplicant ;;esac |
3. May be it is nmcli nm sleep problem. Then try this solution.
4. If none of above helped, try this solution from Ubuntu Forums
1 comment on “Ubuntu – Wifi problem after suspend resume – solution”
after trying oh-so-many workarounds i came accross 1 solution that didnt work but which had the words: if it’s a wifi, first unplug and replug. then do the workaround. unplugging and replugging was enuf!! (kinda like the IT crowd, no?)