Finally, Android 10 Q is official and so the AOSP 10 Source code. Samsung Galaxy S9 Plus (star2lte) is now getting the unofficial version of Lineage OS 17.1 developed by abtekk Recognized Developer on XDA forum. The device is launched on February 2018. The phone came out of the box with Android 8.1 Oreo. Now you can enjoy Lineage OS 17.1 based on Android 10. Full credits to him and Lineage team. Now you can install Lineage OS 17.1 on Galaxy S9 Plus which is stable enough to use as a daily driver.
Android 10 is Google’s 10th version of Android OS with plenty of new features and system UI changes. Google doesn’t come with any dessert item name for the new Android version this time and that’s a good move. If you’re new to the Android ecosystem, it’s worth mentioning that Android is an Open Source Project (AOSP) by Google. With the new released Android 10 source code, the Lineage team has started working on Lineage OS 17.1 for all the supported device.
To install Lineage OS 17.1 on your Galaxy S9 Plus, you need to unlock bootloader and running latest TWRP Recovery. If you are on the old version, you will see error 7 warning text while installing the custom ROM on Galaxy S9 Plus device.
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Galaxy S9 Plus Plus sports a 6.2 inches Super AMOLED display with a screen resolution of 1440 x 2960 pixels. It is powered by 4×2.7 GHz Mongoose M3 & 4×1.8 GHz Cortex-A55 Octa-core Qualcomm SDM845 Snapdragon 845 (10 nm). The device packs 64/128/256GB internal storage and 6GB of RAM. There is 512GB expandable memory support. The camera on this device sports a dual camera 12 MP + 12 MP with an aperture f/1.5/2.4 and a 8 MP shooter for selfies. The Galaxy S9 Plus Plus runs Android 8.0 Oreo and backed by a Li-Ion 3500 mAh battery. The handset has a back mounted fingerprint sensor.
Someone made an unnoficial LOS 17 build for the s9+
https://forum.xda-developers.com/galaxy-s9/samsung-galaxy-s9–s9-cross-device-development/rom-t4020939
you should add it to the list. I haven’t tested it just yet but I’m about to upgrade from LOS 16 and ill let you know how it goes