Hello @rocket2nfinity Thank you, yes i have use TWRP for that, but TWRP write in red 'FAIL...' thank you for the link, i look that now.

Hello all,
I have a Nexus 6p with Lineage 15.1, I would like to install Ubuntu on it, it says on the UbPorts installer "Reset your android 7.12. Critical vendor files ...."
I tried to install the official 6p ROM, but it doesn't want to install. Only lineage work, with ADB Sideload .... I tried to install Ubuntu with lineage 15.1 instead of Android 7.1.2 (with my Ubuntu computer) but the OS blocked on the 'Ubuntu Recovery' page... Can someone help me please?