Use LineageOS recovery to check Ext4 filesystem


Download e2fsprogs-arm.tar.

Bring smartphone into recovery mode.

On the smartphone in the LineageOS recovery, tap on Advanced and Enable ADB

Connect the smartphone with the pc.

Open a terminal and type:

adb push e2fsprogs.tar /
adb shell

On the shell type:

# extract e2fsprogs
tar xfv e2fsprogs.tar
# show available partitions
cat /proc/partitions
# check ext filesystem
e2fsck -p -C0 /dev/block/mmcblk1p1