The update for Wunderment OS to LineageOS 18.1 is now available from the download server!
Unlike the last major version update for WundermentOS, this release requires no special update process as long as you are on the current release of WundermentOS 17.1 (the 2021-04-29 release or newer). Just go to the built in updater via Settings->System->Advanced->Updater and download/install it!
However, like any major update, make sure to backup any data you have on your phone before performing the update just in case. As an extra precaution you may want to enable the OEM unlock feature in developers options in case something goes wrong and you need to restore to a previous operating system via recovery.
Lineage 18.1 brings Android 11 goodness to WundermentOS, however there is one big loss in the upgrade, the built in Mail program. Mail was removed from LineageOS 18.1 due to lack of updates from the Android Open Source Project (AOSP) to the application in a very long time. This has been a trend with the AOSP applications as Google focuses on their internal apps (like GMail). If you’re using Mail you will want to look for a replacement application before upgrading, K9 Mail is a good open source alternative or you can use GMail or Outlook if you are tied in to those ecosystems.