I installed Ubuntu recently. The only changes I did were:
1) Initially I used to start with acpi=off in grub because of nvidia driver issue. Now I removed this setting. Other changes: installed nvidia driver and blacklisted nouveau.
2) Upgraded packages.
I tried other solutions such as reinstalling bcmwl, but that did not solve the problem. Currently I'm using wired network, so the problem is localized to Wi-Fi.
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