I just installed Elementary on my Lenovo S21e. Looks really good but my touchpad and wifi are not working. hope this can be solved.
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Are you able to connect it to the internet somehow? I'm reading the specs and I see this model does not have an Ethernet port. If you can somehow (USB tethering from phone?) get online on it, run in Terminal:
sudo apt update && sudo apt upgrade && sudo apt dist-upgrade
sudo apt install broadcom-sta-common broadcom-sta-dkms broadcom-sta-source
sudo apt-get update && sudo apt-get upgrade
Watch the video in the link below it worked on my laptop, I too had that touchpad problem press ctrl+alt+t for opening the terminal and do what as suggested in the video and restart the system the touch pad works.
Hope it works!!