Post by Michael F. Stemper
Thanks to help obtained here, I now have a "loaner PC" up and
1. No wi-fi. Can't see my router, can't see my neighbor's
routers. I believe that this is because IP issues prevent
inclusion of wi-fi drivers in what Canonical sends out. Is
this correct? (It's not a show-stopper, since I have a 50'
Ethernet cable running across the family room, into the
mud room, down the basement steps, and over to the router.
I just hope that I don't trip over it.)
2. The resolution is messed up. I'm using a 1920x1080
USB-connected flat-screen monitor. However, when I go into
"System Settings/Displays", it shows "Built-in Display",
with the adjacent slider set to "On" and grayed out. Below
is a drop-down with "1024x768 (4:3)" as the only option. My
guess is that since the slider is grayed out, there is no
way to fix this short of installing for real, which I am
not allowed to do. Is this guess correct? Assuming that
I'm stuck with this, will it make an Impress presentation
over Zoom look bad to viewers, or is it strictly a
Thanks as always,
You could remaster the ISO.
I've done this twice.
The first time, was a while back, when Ubuntu had a
purpose-built remastering tool. I could remove LibreOffice
suite from the image, build a new image, and so on. I
removed LibreOffice, as a test of the tool, to see how
much collateral damage there would be. It worked!
Then, as far as I know, that tool no longer received
support, so it got removed.
The second time I did a remaster, it was a trivial remaster.
I needed to open the squashfs, add a firmware file for my
TV tuner card, then put the new squashfs onto the existing
ISO. There is a command (xorriso perhaps), around four lines
of text on the screen long (one of the longer command line
invocations you will ever do on a computer), for making a new ISO
from constituent parts. And I successfully made live
media, so I could boot Ubuntu and immediately watch TV
without a fuss.
Remastering will require research and work.
The other issue with "living Live", is the storage media.
I have two dead 32GB Flash sticks here, which lasted a year
or so when hosting a persistent casper-rw file. The Flash
sticks don't seem to have wear leveling, even though
various web pages will imply that they do. USB flash sticks
are nowhere near as well designed as an SSD with TRIM.
Without wear leveling, focused writes to fixed locations
on the USB Flash, "burn through" the flash cells in that
area. It just does not seem possible to receive sufficient
assurance that this is not happening. I don't consider it
a fluke, when two TLC flash sticks die the same way.
Flash comes in flavors. SLC, MLC, TLC, QLC. SLC parts
are (or were) made by several companies. I was surprised
to find two of the companies were larger companies. SLC
is "the good stuff" -- it is flash suitable for persistent
Live media usage. The weird part, is none of the
companies is a marketing genius, the website tends to
hide, obscure or downright not carry technical information.
This makes it harder to trust vendors selling such material.
If an Amazon vendor says "we have SLC flash 32GB using
the following Toshiba chip", then you go and try to look
up the chip number, you're not likely to find a datasheet
Another issue, is the size of the persistent casper-rw. It
was limited to 4GB at one time. This is not nearly big
enough for any practical purpose. I've done some trivial
package management work and filled that space up, so it's
just not big enough. You might need to find some other
way to do that, or research whether a bigger version
of casper-rw methodology is available. The last poster here,
suggests an EXT2 partition with a label of "casper-rw" as
SSD solutions are likely to be slightly too big to
fit in the USB flash form factor. Usually such USB
devices have a "blob" on the end, which is inconvenient.
And being on USB, you would want to research whether TRIM
is available as a passthru command on the device
(TRIM enlarges the free pool and makes it easier for the
SSD portion to consolidate storage).
With an SSD on USB, you could do a regular installation.
And the SSD would be less likely to burn through and
fail the first year.