I have mounted the Debian partition from Android using Termux. Works fine, but requires root.
hi, please, how was your mount command? I now rooted but I cannot see /dev/mmcblk0p29, the name of Linux partition, as Adam said...
Where did you download the magisk manager apk from?
now I succeeded rooting Android, after the trial boot flashing: I changed Magisk location from sd to internal memory and it eventually worked, installed its files and rooting completed.
salvo