I used the free -h command to show the available RAM in the live image of Lubuntu loaded into RAM .
If I created it by the command: dd if=lubuntu-19.04-desktop-amd64.iso of=/dev/sdb bs=512k, then I get my actual total ram.
But if I created the live-usb using MKusb, I get about 1gb less of ram ... I'm using Mkusb to make a persistent live usb.
I was trying to create a persistent storage on a Live Ubuntu USB drive. Then I came to many tutorials that required mkusb. I've searched for many ways to install it but I couldn't, even after adding PPAs, restarting, editing sources.list, etc. This is the output:
$ sudo add-apt-repository ppa:mkusb/ppa
More info: https://launchpad.net/~mkusb/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.
Hit:1 http://ppa.launchpad.net/mkusb/ppa/ubuntu bionic InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 http://vn.archive.ubuntu.com/ubuntu bionic InRelease
Hit:4 http://vn.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:5 http://vn.archive.ubuntu.com/ubuntu bionic-backports InRelease
Reading package lists... Done
$ sudo apt update
Hit:1 http://ppa.launchpad.net/mkusb/ppa/ubuntu bionic InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 http://vn.archive.ubuntu.com/ubuntu bionic InRelease
Hit:4 http://vn.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:5 http://vn.archive.ubuntu.com/ubuntu bionic-backports InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
$ sudo apt install mkusb
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package mkusb
I don't know if I made some mistakes somewhere. Thanks!
EDIT: I managed to install mkusb using tarball, but it doesn't detect my USB drive. But the main point is finished, maybe I will ask another question. Thank you!
I've successfully used mkusb to install a persistent Ubuntu 18.04.2 LTS system on a new Samsung T5 USB SSD. What is nice about mksusb is that it creates a bootable system that works on a wide variety of computer systems. However, I would like to have a portable 'real' Ubuntu installation vs. a live/persistent install that works with both UEFI and BIOS boot methods.
The process outlined here looked like it would do the trick, but in my case I'm just presented with the grub prompt when booting the drive. Note, that I interpreted the step:
Cut grub.cfg from sdx5/boot/grub and paste to sdx3/boot/grub, overwriting the existing grub.cfg file
...to mean that I should move the new grub.cfg file from /dev/sdx5/boot/grub to /dev/sdx3/boot/grub, overwriting the grub.cfg file created by mkusb and deleting the grub configuration file created by the installation from the installation partition. Also, /dev/sdx3 was not mounted after the Ubuntu installation completed, I had to manually mount it (/dev/sdx5 was already mounted on /target).
Since mkusb without modifications works fine with the T5 SSD drive, I assume that there is something about the Ubuntu 18.04.2 LTS installation grub.cfg file that is causing an issue.
Is there an alternative approach that would work, or is there something inherently different with a portable SSD vs. a USB thumb drive that prevents creating a truly portable drive?
Update: I just ran through the process linked above with a spare 64GB micro-USB drive, and it worked fine. I was able to boot it via BIOS and UEFI modes. I think I can safely rule out the specific version of Ubuntu (18.04.2) as the source of the problem, and assume that there is something unique about using a USB SSD vs. a 'standard' thumb drive... not sure if it's the drive size or the hardware interface (I suspect the latter).
I've got an mkusb live USB (Ubuntu 18.04 with persistence) that boots fine on some of my computers. On one laptop I get the following error:
error: disk `hd0,4' not found.
error: you need to load the kernel first.
What do I need to do to, "load the kernel first"?
EDIT: An SD card occupying an SD slot was causing this issue. Removing the SD card allows mkusb to boot properly, and eliminates the error. Once booted I reinsert the SD card into the SD slot if I need to use it.
I'm trying to create a persistent live Ubuntu bootable USB drive using mkusb.
In the "Persistent live drive settings" I have the options "msdos", "upefi" and "d-n-i", and also have the buttons "Use defaults" and "OK".
Unfortunately, I couldn't find in the wiki nor the manual what each item or the "Use defaults" button does.
Clicking "Use defaults" is the same as clicking "OK" without any item selected? And what is the meaning of each item? When should (or shouldn't) each one be used?