How to dualboot in puppy Linux (q4os with puppylinux)?

[Slowayou]

I am beginner on linux how to dualboot a q4os with puppy Linux?
I create partition like this

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/dev/sda1 swap
/Dev/sda2 primary (bootable) q4os
/Dev/sda3 primary (bootable) puppy linux

When I try that and rebooting I got following error for grub4dos

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wee 0> find --set-root /grldr
(0x80,1)
Wee 0> /grldr
Wee 13> 

(Sorry for bad grammar and English)

[Phoenix]

The grub4dos console output is not an error. Please post the actual error. (Unless the problem is that you have no grub configuration)
Nevertheless, usually you can use the various installation utilities in the Setup category in the menu. If not, please post the grub.cfg for q4os and bionicpup. (P.S you should use fossapup sometime.)

However I have also noticed your first partition is swap type. This may be a serious error seeing as some systems only support the first partition on a USB. If its not a USB, its fine mostly.

[bigpup]

For sure your partitioning is wrong.

The first partition needs to be a small 100MB to 300MB size, formatted fat32, flagged boot.
Used as boot partition, with all the boot loader files on it.

The two other partitions seem OK, but what format are they?

Make a 4rth partition as the swap partition.

To give you more advice we really need this information:
viewtopic.php?t=218

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Usually for duel installs with other Linux OS's.

Install the other OS first.
Then install Puppy Linux.
Then install the boot loader to boot both of them.

Grub4dos is good at making boot loader menu entries for other Linux OS's, if it finds them installed on the drive.
But there are so many Linux OS's, that it may not make one.
You may need to manually make the menu entry.