Update, Nov 2, 2022 - see my recent post, for a correction of my problem installing on a RPi 4.
I was now able to install MotionEyeOS, without a problem. :-)
So, I was recently having some issues with the MotionEyeOS webcam surveillance software running on my RPI 3 B.
So I thought I would try and run the MotionEyeOS software on my RPI 4, 4GB. No luck, it didn't even boot up.
I of course did use the correct MotionEyeOS program for the RPI 4.
On goggling the problem, I found others were having the same issue with the RPi 4 and MotionEyeOS. The fix seems to be, to make sure the RPI 4 firmware has been updated.
To update the RPI 4 firmware, you have to install the Raspbian OS software on the micro sd card, that the RPI boots from. Sigh! Then you issue some command line update commands, which is suppose to update the firmware.
The RPI 4 8 GB board also has some issues that have to be worked around, until the MotionEyeOS program is updated. The programs current release is dated 2020.
I have just finished putting the Raspbian OS on the micro sd card and I will try and do a firmware update of my RPI 4 4GB, tomorrow. Stay tuned. :-)