You might continue with repo sync -j1 --fail-fast --force-sync and keep checking / searching the errors, you may get a resolution, or you may decide the environment is contaminated.
Edit, seen late
ERROR: missing required binary: aapt
sudo apt install aapt
Another edit, seen late.
I found an alternative and much newer kernel source under “forks”: https://github.com/sileshn/android_kernel_samsung_msm8930-common. To apply it, a suggested …
manifest revision
<?xml version="1.0" encoding="UTF-8"?>
<manifest>
<project name="LineageOS/android_device_samsung_serranoltexx" path="device/samsung/serranoltexx" remote="github" />
<project name="LineageOS/android_device_samsung_serrano-common" path="device/samsung/serrano-common" remote="github" />
<project name="LineageOS/android_device_samsung_qcom-common" path="device/samsung/qcom-common" remote="github" />
<project name="LineageOS/android_device_samsung_msm8930-common" path="device/samsung/msm8930-common" remote="github" />
<!-- kernel sileshn
##################################################### -->
<remote name="sileshn" fetch="https://github.com/" />
<project name="sileshn/android_kernel_samsung_msm8930-common" path="kernel/samsung/msm8930-common" remote="sileshn" />
</manifest>