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This is a showcase video of running Waydroid + Android 11 with scrcpy (Android ScreenCopy), working Magisk v25.2 and working Terminal Emulator without /dev/tty error.

All of this is done in Waydroid-Linux-beta (Debian Operating system with GNOME Desktop), download link on sourceforge.

The reason i am using scrcpy to show the Android screen is because the default wayland screen is detected the keyboard and mouse,
so, a few apps/games can't be clicked/touched with mouse.

There are a few steps and Trial&Error before reaching this stage;

1. Setup the Linux
- Setting up the Linux, first step
-->Upgrade waydroid python3-gbinder and its dependencies
--->DON'T UPGRADE THE SYSTEM, IT WILL BREAK EVERYTHING
--->Don't ever upgrade to python3.10, it will remove waydroid and its dependencies
-->Install android-platform-tools or download the adb manually
-->Install scrcpy
-->Download LineageOS-18.1-waydroid Android 11 images

2. Setup Waydroid
- Setting up waydroid to work with Android 11, referencing on a youtube video
-->Edit the gbinder config to use aidl3
--->/etc/gbinder.d/anbox.conf
+-----------------------------------------------------------+
[Protocol]
/dev/anbox-binder = aidl3
/dev/anbox-vndbinder = aidl3
/dev/anbox-hwbinder = hidl

[ServiceManager]
/dev/anbox-binder = aidl3
/dev/anbox-vndbinder = aidl3
/dev/anbox-hwbinder = hidl

[General]
ApiLevel = 30
+-----------------------------------------------------------+
-->Setting Unprivileged BPF
--->Make sure Unprivileged BPF Status is: 0
--->Run: sudo sysctl kernel/unprivileged_bpf_disabled=0
--->For easier use so you don't have to run this command every reboot, create service
---->Create /etc/systemd/system/set_bpf.service, enable it: sudo systemctl enable set_bpf
+-----------------------------------------------------------+
[Unit]

Description=Set Unprivileged BPF Status At Boot

After=display-manager.service

[Service]

ExecStart=/yourhome_or_dir/.bin/set_bpf.sh

[Install]

WantedBy=default.target
+-----------------------------------------------------------+
---->Create script file, /yourhome_or_dir/.bin/set_bpf.sh
+-----------------------------------------------------------+
#!/bin/bash

sysctl kernel/unprivileged_bpf_disabled=0

echo "Unprivileged BPF Status is:"
cat /proc/sys/kernel/unprivileged_bpf_disabled
+-----------------------------------------------------------+
-->Reboot Linux

3. Installing Magisk manually;
- Yes, i have to install the Magisk manually by referencing waydroid_script install script and a few github issues
-->Enter your working folder, e.g; $HOME/mymagisk/
-->Download Magisk v25.2, then extract the apk
-->Resize system.img, i choose 3GB
-->Mount system.img in rw mode to system; #mount -o loop system.img system
-->Resize vendor.img, i choose 500MB
-->Mount vendor.img in rw mode to system/vendor; ; #mount -o loop system.img system/vendor
-->Make sure to run waydroid once, so $HOME/.local/share/waydroid/data folder is created
-->Mount $HOME/.local/share/waydroid/data to userdata; #mount -o bind $HOME/.local/share/waydroid/data userdata
-->Delete system/sbin folder, if exists
-->Create system/magisk folder
-->Follow some steps in https://github.com/casualsnek/waydroid_script/issues/12
-->Rename all *.so files in Magisk-v25.2/lib/x86_64 to their respective names
--->e.g; libbusybox.so to busybox
--->do this to all *.so files
-->Copy renamed files to system/magisk
-->Copy Magisk-v25.2/lib/x86_64/magiskpolicy to your working folder, e.g; $HOME/mymagisk/
-->Rename libmagisk32.so->magisk32 in Magisk-v25.2/lib/x86 and copy to system/magisk
-->Follow steps in MagiskOnWSA/blob/main/.github/workflows/magisk.yml, with modifications
+-----------------------------------------------------------+
#sudo chcon --reference system/init.environ.rc system/sbin
sudo chcon --reference system/init.environ.rc system/magisk
sudo chown root:root system/magisk
sudo chmod -R 0700 system/magisk
sudo mkdir -p userdata/adb/magisk
sudo chmod -R 700 userdata/adb
sudo cp system/magisk/* userdata/adb/magisk/
sudo find userdata/adb/magisk -type f -exec chmod 0755 {} ;
sudo cp Magisk-v25.2.apk userdata/adb/magisk/magisk.apk
sudo tee -a system/magisk/loadpolicy.sh <<EOF
#!/system/bin/sh
restorecon -R /data/adb/magisk
for module in $(ls /data/adb/modules); do
    if ! [ -f "/data/adb/modules/$module/disable" ] && [ -f "/data/adb/modules/$module/sepolicy.rule" ]; then
        /sbin/magiskpolicy --live --apply "/data/adb/modules/$module/sepolicy.rule"
    fi
done
EOF
sudo find system/magisk -type f -exec chmod 0755 {} ;
sudo find system/magisk -type f -exec chown root:root {} ;
sudo find system/magisk -type f -exec chcon --reference system/product {} ;
chmod +x ./magiskpolicy
echo '/dev/wsa-magisk(/.*)?    u:object_r:magisk_file:s0' | sudo tee -a system/vendor/etc/selinux/vendor_file_contexts
echo '/data/adb/magisk(/.*)?   u:object_r:magisk_file:s0' | sudo tee -a system/vendor/etc/selinux/vendor_file_contexts

sudo ./magiskpolicy --load system/vendor/etc/selinux/precompiled_sepolicy --save system/vendor/etc/selinux/precompiled_sepolicy --magisk "allow * magisk_file lnk_file *"
+-----------------------------------------------------------+
-->Modifying system/system/etc/init/hw/init.rc
---> My init.rc:
+-----------------------------------------------------------+
on post-fs-data
    start logd
    start adbd
    mkdir /dev/wsa-magisk
    mount tmpfs tmpfs /dev/wsa-magisk mode=0755
    copy /magisk/magisk64 /dev/wsa-magisk/magisk64
    chmod 0755 /dev/wsa-magisk/magisk64
    copy /magisk/magisk32 /dev/wsa-magisk/magisk32
    chmod 0755 /dev/wsa-magisk/magisk32
    symlink ./magisk32 /dev/wsa-magisk/magisk
    symlink ./magisk64 /dev/wsa-magisk/su
    symlink ./magisk64 /dev/wsa-magisk/resetprop
    copy /magisk/magiskinit /dev/wsa-magisk/magiskinit
    chmod 0755 /dev/wsa-magisk/magiskinit
    
    #tried without this, but magisk not detected by manager
    #
    mkdir /sbin
    mount tmpfs tmpfs /sbin mode=0755
    copy /magisk/magisk64 /sbin/magisk64
    chmod 0755 /sbin/magisk64
    copy /magisk/magisk32 /sbin/magisk32
    chmod 0755 /sbin/magisk32
    symlink ./magisk32 /sbin/magisk
    symlink ./magisk64 /sbin/su
    symlink ./magisk64 /sbin/resetprop
    copy /magisk/magiskinit /sbin/magiskinit
    chmod 0755 /sbin/magiskinit
    
    # 24107
    copy /magisk/magiskpolicy /dev/wsa-magisk/magiskpolicy	
    chmod 0755 /dev/wsa-magisk/magiskpolicy
    copy /magisk/magisk.apk /dev/wsa-magisk/stub.apk
    #symlink ./magiskinit /dev/wsa-magisk/magiskpolicy # Fix for magisk 24.3-24107 - due to absence of magiskpolicy applet
    
    mkdir /dev/wsa-magisk/.magisk 700
    mkdir /dev/wsa-magisk/.magisk/mirror 700
    mkdir /dev/wsa-magisk/.magisk/block 700
    rm /dev/.magisk_unblock
    start IhhslLhHYfse
    start FAhW7H9G5sf
    # fix for magisk modules to load properly
    umount /dev/wsa-magisk/.magisk/mirror/data
    rm /dev/wsa-magisk/.magisk/mirror/data
    symlink /data /dev/wsa-magisk/.magisk/mirror/data
    wait /dev/.magisk_unblock 40
    rm /dev/.magisk_unblock

service IhhslLhHYfse /system/bin/sh /magisk/loadpolicy.sh
    user root
    seclabel u:r:magisk:s0
    oneshot

service FAhW7H9G5sf /dev/wsa-magisk/magisk --post-fs-data
    user root
    seclabel u:r:magisk:s0
    oneshot

service HLiFsR1HtIXVN6 /dev/wsa-magisk/magisk --service
    class late_start
    user root
    seclabel u:r:magisk:s0
    oneshot

on property:sys.boot_completed=1
    start YqCTLTppv3ML
    start YqCTLTppv3MK

service YqCTLTppv3ML /dev/wsa-magisk/magisk --boot-complete
    user root
    seclabel u:r:magisk:s0
    oneshot

# fix for Terminal/Termux to work
# i put this here to make sure the workaround not started too early
service YqCTLTppv3MK /system/bin/sh /magisk/fix-term.sh
    user root
    seclabel u:r:magisk:s0
    oneshot
+-----------------------------------------------------------+
-->Create fix-term.sh in system/magisk
--->fix-term.sh
+-----------------------------------------------------------+
#!/system/bin/sh

# fix for Terminal/Termux to work
mknod -m 666 /dev/tty c 5 0
mknod /dev/tty1 c 4 1

+-----------------------------------------------------------+
-->Copy Magisk-v25.2.apk to system/system/app/Magisk/Magisk.apk
-->Final structure:
-->(myworkdir)/
--->magiskpolicy
---->magisk/
------>magisk/busybox
------>magisk/magisk.apk
------>magisk/magisk32
------>magisk/magisk64
------>magisk/magiskboot
------>magisk/magiskinit
------>magisk/magiskpolicy

---->system/magisk/
------>system/magisk/busybox
------>system/magisk/magisk.apk
------>system/magisk/magisk32
------>system/magisk/magisk64
------>system/magisk/magiskboot
------>system/magisk/magiskinit
------>system/magisk/magiskpolicy
------>system/magisk/fix-term.sh

---->userdata/adb/magiskpolicy
---->userdata/adb/magisk/
------>userdata/adb/magisk/busybox
------>userdata/adb/magisk/magisk.apk
------>userdata/adb/magisk/magisk32
------>userdata/adb/magisk/magisk64
------>userdata/adb/magisk/magiskboot
------>userdata/adb/magisk/magiskinit
------>userdata/adb/magisk/magiskpolicy


4. Clean up and Run
- Cleaning up work
-->Unmount all mounted images and data folder
-->Copy/move/replace system.img and vendor.img to /var/lib/waydroid/images
-->Restart Linux
-->Start Waydroid session: waydroid session start / waydroid show-full-ui
-->Make sure everything is alright and waydroid is running: waydroid show-full-ui
-->If Waydroid not showing up, check for error in logcat: sudo waydroid logcat

Done!

Disclaimer: at least this is working for me. if it is not working for you then maybe we are different ;-)