Pokemon-go – Pokemon go update gmail login issues

There are a number of possible solutions:

1. Settings --> Privacy and safety --> Location: Check if "Location" is On. Then click on Location method and enable the method including GPS, Wifi and mobile networks
2. Switch Airplane mode On, wait half a minute or so, then turn in Off again
3. Make sure that Wifi is turned on, even if you are in a non-Wifi area (see 1.)
4. Go outdoors into an area where you can see a big part of the sky
5. Restart the app (make sure you properly close it)
6. Restart your phone and check with another app if your location is found before you start Pokemon Go
7. Check if you have the latest version of Pokemon Go installed
8. I think in newer Android versions than mine, you can specifically set permissions for each app individually. If that is the case, check if Pokemon Go is allowed to use the GPS
9. I am sure there is something more... I'll update this list if somebody comes up with another idea

You must be using a wrong Gmail. I can confirm you should have no problem, since I did the exact same thing this week. All the data is stored on a server, linked to your google account, so no need to worry about loosing your progress, just try to find out which google account you were using and you will be ready to go.