Since LineageOS is "de-Googled," you need an OpenGApps (ARM, 7.1, Nano or Pico) package for the Play Store.
Before diving into the flashing process, it is crucial to understand exactly what this file is. The name is a standard naming convention used by the LineageOS community, broken down as follows: lineage-14.1-20180419-UNOFFICIAL-gtel3g
Go to Settings > About Device and confirm your model number is SM-T561 (or explicitly confirmed by your local development thread as gtel3g ). Do NOT flash this on an SM-T560. Since LineageOS is "de-Googled," you need an OpenGApps
By the time the April 19, 2018 build rolled out, developer dedication had brought this ROM to near "daily driver" status. However, because it is an unofficial project built via reverse-engineering, users should manage their expectations. Since LineageOS is "de-Googled