LineageOS, the most-popular aftermarket Android distribution was recently updated to version 17.1 based on Android 10. When it happened, a number of devices soon garnered official support and we even made an entire list of official devices back then. Now, the Exynos Galaxy S9 / Galaxy S9 Plus and Galaxy Note 9 has been added to the list, in addition to Realme 2 Pro, however, it only supports LineageOS 16 for now.
The Exynos-powered Galaxy S9, Galaxy S9 Plus, and Galaxy Note 9 have been lately receiving unofficial builds of LineageOS 17.1 by a number of developers on the XDA Developers forum. But now, these devices are now finally receiving official builds for the first time. For comparison, the LineageOS project still does not support the Snapdragon variant of these smartphones yet.
The officially supported LineageOS 17.1 Galaxy S9, Galaxy S9 Plus, and Galaxy Note 9 models are as listed below.
Galaxy S9 Plus
Galaxy Note 9
As mentioned earlier, the Realme 2 Pro (RMX1801) is also now officially supported by LineageOS project. But unlike the above-mentioned Samsung devices, the builds are limited to LineageOS 16 based on Android Pie. Hopefully, it will gain support for LineageOS 17.1 once the company rolls out the stable Realme UI update to it.
Sadly, the legendary Redmi Note 4, well-known in the custom ROM community has been dropped support for LineageOS as the maintainer no longer has the device with him.