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I have a raspberry pi 2 with ubuntu sever installed and need to know how to lower the gpu settings from 64 megs to 16 megs.

Ubuntu Server does not come with raspi-config installed.

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This is an option set in /boot/config.txt, presuming Ubuntu mounts the first partition there:

gpu_mem=16

It may be mounted on a slightly different path in a subdirectory of /boot, try find /boot config.txt.1 Also, because it is in the small first partition on the card formatted vfat, you should be able to access it from any computer.

You need to reboot for any changes in config.txt to take effect.

Ubuntu Server does not come with raspi-config installed.

It's just a shell script and currently can be downloaded from: https://github.com/RPi-Distro/raspi-config

  1. Another, more bulletproof method is mount | grep mmcblk0, since /dev/mmcblk0 is the SD card, and it's partitions are /dev/mmcblk0p1 (the boot partition), /dev/mmcblk0p1, etc. If mmcblk0p1 isn't there, just mount it yourself.
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  • I don't have a config.txt file when I check my /boot dir and installing raspi-config I don't think that will work with ubuntu Commented Sep 4, 2022 at 16:34
  • The first partition of the SD card must be a vfat partition containing some specific files, regardless of the distro since otherwise the Pi would not boot, period. So it is there on the card. I think config.txt may not actually be required, but I would be very surprised if it were not there. In any case, try find /boot bootcode.bin, since that does need to be there. If it isn't, the boot partition can be mounted wherever and accessed, it is the first partition on the drive, /dev/mmcblk0p1, I've edited in an easier way to find that above. Commented Sep 4, 2022 at 20:06
  • If the information here still leaves you perplexed, then very seriously and honestly: As someone obviously new to both the Pi and linux, you are making a big mistake not using the most widespread distro in common use, ie., Raspbian/RpiOS, for which there is tons of documentation and help available. If you don't need this (but it seems clear that you do), you are going to find yourself wasting a lot of time up a creek listening to crickets. Commented Sep 4, 2022 at 20:06

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