adb remount fails - mount: 'system' not in /proc/mounts

Question

I tried all the commands and suggestions available in stackoverflow and online but none worked

• https://stackoverflow.com/a/13366444/1441666
• https://stackoverflow.com/a/28018008

and many more but nothing works for me

I am getting below error - None of below commands are working.

$adb root
$adb disable-verity

For

$adb remount
remount of / failed: Permission denied
remount failed

So then I tried with different commands like

$ adb shell mount -o rw,remount /system
mount: '/system' not in /proc/mounts

$ adb shell mount -o rw,remount /
'/dev/root' is read-only


$ adb shell  mount -o rw,remount -t /dev/block/stl12 system
mount: 'system' not in /proc/mounts

$ adb shell "su 0 mount -o rw,remount /system"
mount: '/system' not in /proc/mounts

$ adb shell
$ su
# mount -o rw,remount /system

 mount: '/system' not in /proc/mounts

Answer 1

> adb root
> adb shell avbctl disable-verification
Successfully disabled verification. Reboot the device for changes to take effect.
> adb disable-verity
using overlayfs
Successfully disabled verity
Now reboot your device for settings to take effect
> adb reboot
> adb root && adb remount
remount succeeded
> adb push ScreenCap.apk /system/app/
ScreenCap.apk: 1 file pushed. 33.1 MB/s (1640812 bytes in 0.047s)
> adb reboot