You can always leave BioKids; nothing locks you in. How to remove it depends on how you installed it.
Which case are you?
First: your family's backup (optional)
If you might install it again one day, use Settings → Back up and move → Download the backup in the panel to save the children's rules and history as one file, and copy it to a USB stick. The file is sealed with your family passphrase; it holds no PINs and no mail settings.
Remove BioKids, keep Debian
Even when installed from the ISO, BioKids sits on top of Debian as packages. Remove them and a plain Debian with the Xfce desktop is left. Sign in with your own account and open a terminal:
Delete the assistant's models (if installed)
This deletes Ask Me's models, several GB of them.
sudo apt purge biokids-aiRemove BioKids
sudo apt purge biokids biokids-desktop biokids-core biokids-daemon biokids-panel biokids-shell biokids-voiceIt asks one question: "Delete the stored BioKids data for this family?" The default answer is No, and the records stay on the computer. Answer Yes to delete everything: the rules, the history, the voice recordings and the downloaded natural voice.
This also brings back Debian's usual boot menu.
Delete the children's accounts (if you want)
The children's accounts on the computer, and their files (their drawings, for example), are left on purpose. To delete them, once for each child, with their username:
sudo deluser --remove-home elifClean up what is left
sudo apt autoremoveIf you turned on phone access, Tailscale was installed as well; remove it with
sudo apt purge tailscaleif you no longer need it.
Go back to Windows only
If the computer has both Windows and BioKids, you can delete BioKids' partitions and give the space back to Windows. These are Windows' own tools, not BioKids'; do it carefully and in order.
Start Windows
Choose Windows Boot Manager in the boot menu.
Make Windows start first
Type
cmdin Start, right-click Command Prompt, choose Run as administrator and type:Command Prompt (administrator)bcdedit /set {fwbootmgr} displayorder {bootmgr} /addfirstRestart: Windows should start directly, without the menu. If it does not, stop here and move Windows Boot Manager to the top of the Boot Order in the computer's settings (BIOS/UEFI).
Delete BioKids' partitions
Right-click the Start button and open Disk Management. BioKids' partitions have no drive letter; recognise them by size: one as large as the space you freed for BioKids, and a smaller swap partition of a few GB next to it. Right-click each and choose Delete Volume.
Disk 0
EFI100 MBWindows (C:)197 GBHealthy (Primary Partition)~36 GB · deleteswapdeleteRecoveryWindows' (leave alone)BioKids' (delete)Illustration Delete only the red ones. Do not touch EFI, C: or Recovery. Grow C:
Right-click C: → Extend Volume… → Next → Finish. The free space joins C:.
If Windows greys this option out, the free space is not right next to C: (a Recovery partition may sit between them). Then right-click the free space and use New Simple Volume to make it a separate drive (D:).
Remove the debian folder from EFI (optional)
So that an unused "debian" entry does not linger in the firmware's boot list, type these one by one in an administrator Command Prompt. Type the letters carefully.
Command Prompt (administrator)mountvol S: /s rd /s /q S:\EFI\debian mountvol S: /d
If BioKids is the only system
Two ways: go back to a plain Debian with the package steps above, or install another system (Windows, for example) from its own USB stick. Its installer erases the disk, so take your family's backup and your files first.
Something wrong?
After deleting, a black screen says "grub rescue"
The computer is still looking for BioKids' boot loader. Open the computer's settings (often F2, F10 or Del) and move Windows Boot Manager to the top of the Boot Order. On a Legacy (BIOS) install, run bootrec /fixmbr from Windows' recovery environment.
What happens to my family's data?
It stays on the computer unless you choose to delete it. Answer Yes to the question asked while removing, and the rules, history and records are deleted. If you deleted the partitions, it is all gone anyway.
Can I install it again later?
Of course. After installing, load your backup with Back up and move → Restore in the panel, and the children's rules and history come back.