Trying to format SDCard to BTRFS and share android space. ERROR : umount: /media/sdcard: target is busy

Is there a possibility my jolla is faulty? Thanks for your input, but I have tried this 3 times now and still the message [root@dhcppc18 /]# umount /dev/mmcblk1 umount: /media/sdcard: target is busy. (in some cases useful info about processes that use the device is found by lsof(8) or fuser(1))

Whar do the lsof or fuser report? Which processes have locked the partition that you are trying to umount..?

Sorry @jjaone I am not very techy, so I am unaware of the correct command to enter

I have tried a few e.g lsof -F etc... , which bring up a lot of random information (unless you know what you are looking for)

the command "lsof /mnt/rootfs , does not bring anything up for me

lol I should have tagged this question Jolla Use for dummies, hopefully we can get to the root of the problem soon

@ozzyo1212 Well the guide to format the card to btrfs for #SailfishOS and android is quite advanced-level so typing simply:

lsof /media/sdcard

to see which process has opened that folder shouldn't be that hard.. ;) If that command does not display anything then you can add +D option to the command to make it check which process(es) are maybe blocking files in that folder If you actually tried to type: umount /media/sdcard and get the response "device is busy" then there must be some process that is blocking the unmounting of it (most probably the android-runtime). As for me, I have been able to follow the guide and have a 32 GB card formated as btrfs, but while I was doing that I didn't even have the AlienDalvik installed so no droid-runtime interference in my case And, please note the guide does not work in 1.1.2.x because of the changes in android-runtime (but if you completely uninstall Android support you might succeed in following the guide).

@jjaone No information comes up with those prompts. I Did the extreme and opted for the factory reset, installed android support , google play etc. & it seems to have worked, but as usual there is always something. I am now stuck on :

*preparing the system* create /etc/systemd/system/androidsdcard.service

the message bash: create: Command not found ..... appears on the screen.

Do I need to exit Terminal / restart my phone before doing this?... I have currently left terminal open, and am not using my phone until I can fix this.