Re: Scanner works!

[Patrick O'Callaghan]

On Sun, 2023-10-15 at 12:28 -0600, Joe Zeff wrote:
> On 10/15/2023 12:05 PM, Patrick O'Callaghan wrote:
> >     Use 'sudo avahi-browse -a -t' to check that
> >     printer, scanner etc. are all visible. Use
> >     DNS-SD (Avahi) versions of drivers.
> 
> If you don't need it very often, you're best off making it into a
> shell 
> script so that you don't need to worry about forgetting the syntax.

Since I don't need it very often, I prefer not to create a script so I
can copy/paste from my notes to remind me what it does. The notes also
have a copy of the expected output in case something changes. YMMV of
course.

> ~/bin is in the default path, although the directory doesn't exist
> until you create it, which is a tad odd.

I'm aware of that.

poc
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Re: Scanner works!

[Joe Zeff]

On 10/15/2023 12:05 PM, Patrick O'Callaghan wrote:

Use 'sudo avahi-browse -a -t' to check that
printer, scanner etc. are all visible. Use
DNS-SD (Avahi) versions of drivers.


If you don't need it very often, you're best off making it into a shell 
script so that you don't need to worry about forgetting the syntax. 
~/bin is in the default path, although the directory doesn't exist until 
you create it, which is a tad odd.

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Re: Scanner works!

[Patrick O'Callaghan]

On Sun, 2023-10-15 at 11:02 -0400, Jeffrey Walton wrote:
> I found I have to wake the scanner up before trying to connect to it
> over the network. I don't know if the scanner responds to the magic
> wakeup packet.

Very occasionally my Brother all-in-one needs to be prodded with an
avahi command. My notes say:

   Use 'sudo avahi-browse -a -t' to check that
   printer, scanner etc. are all visible. Use
   DNS-SD (Avahi) versions of drivers.
   
I used to use the proprietary driver from Brother but dropped it over a
year ago and haven't looked back.

poc
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Re: Upgrading to Fedora 38: Misleading 'verify' instructions

[Tim via users]

On Sat, 2023-10-14 at 19:06 +0100, John Pilkington wrote:
> On trying to verify the download, using
> 
> https://fedoraproject.org/en/workstation/download/
> 
> I got a report that "17 lines are improperly formatted".

As an example, the downloaded checksum file for one of the ISO files is
this:

 -BEGIN PGP SIGNED MESSAGE-Hash: SHA256

# Fedora-Workstation-Live-x86_64-38-1.6.iso: 2099451904 bytes
SHA256 (Fedora-Workstation-Live-x86_64-38-1.6.iso) =
7a444a2e19012023bf0b015ae30135bafc5fd20f4f10d42b118745093992
-BEGIN PGP SIGNATURE-
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=7dH0
-END PGP SIGNATURE-

The GPG check of that file verifies the message content with the
signature content, and with the GPG key separately downloaded.  If it
passes that test you have a checksum file you can trust.

The sha256sum test using that file knows how to use the SHA256 data in
the message, but rest is gibberish to it.  It complains about that.  If
the SHASUM agrees with your downloaded ISO file, you should also get a
message about that.

After GPG checking the checksum, you could delete all the PGP stuff
from that file, and just keep the checksum info, and try the sha256sum
test like that (for a less confusing output).

To me, copying and pasting a checksum from a HTTPS page is less painful
than this malarkey.  Even just doing a checksum on the downloaded ISO
and eyeballing the hash between it and what was written on a webpage is
less annoying.  And the old behaviour of having a dozen checksums for
each different ISO file in the same text file was also a pain, you'd
get one OKAY message (for the ISO you downloaded) buried in a lot error
messages for all the other ISO files you didn't download.

Even after this step, you've only verified what you download.  If you
write it to a USB drive, or a DVD, you still need to verify that *that*
write worked fine.  It's not just a verification about anti-tampering,
it's verification against write errors.

The verification procedures and instructions still need more thought.

-- 
 
NB:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the list.
 
The following system info data is generated fresh for each post:
 
uname -rsvp
Linux 6.2.15-100.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu May 11 16:51:53
UTC 2023 x86_64
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Re: Scanner works!

[Joe Benson]

I've had two Brother printers/scanners, currently a MFC-7820N, and never
had any issues running them under Fedora. Brother Linux support has been
great. I'm using Xsane for the scanner.

On Sun, Oct 15, 2023 at 7:55 AM Tom Horsley  wrote:

> In the past I have had near infinite trouble getting scanners
> compatible with linux, but I just replaced a dead Epson multi-function
> device that I only ever used as a scanner with a Canoscan LIDE 300
> and was shocked and amazed when it just worked out of the box.
>
> P.S. The epson isn't quite as bad as HP forbidding you from using
> the scanner if it is out of ink, but it finally decayed to the
> point that it decided there were errors with the ink cartridges,
> and nothing would allow it to use the scanner after that.
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Re: Scanner works!

[Jeffrey Walton]

On Sun, Oct 15, 2023 at 9:55 AM Tom Horsley  wrote:
>
> In the past I have had near infinite trouble getting scanners
> compatible with linux, but I just replaced a dead Epson multi-function
> device that I only ever used as a scanner with a Canoscan LIDE 300
> and was shocked and amazed when it just worked out of the box.

I recently purchased a stand-alone HP ScanJet Pro 4500 (L2749A),
.

The L2749A works fine with KDE Ubuntu's Skanlite, but I have not tried
with KDE Fedora.

I found I have to wake the scanner up before trying to connect to it
over the network. I don't know if the scanner responds to the magic
wakeup packet.

> P.S. The epson isn't quite as bad as HP forbidding you from using
> the scanner if it is out of ink, but it finally decayed to the
> point that it decided there were errors with the ink cartridges,
> and nothing would allow it to use the scanner after that.

Ironically, I bought the L2749A because my multi-function Epson
Workforce 630 did the same thing. I could not scan anymore on the
Workforce due to ink problems, so I bought a stand-alone scanner.

I filed a complaint about Epson with my Attorney General's office. It
is unlawful to tie products and services, like scanner function to
Epson ink.

The thing is, it is so profitable for companies to engage in the shady
practice, the companies will not change. The companies still make more
money after the fines for doing it, so there's no reason to stop. It
does not matter how many times the FTC or a state Attorney General
drags them into court.

Jeff
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Upgrading to Fedora 38: more comments

[John Pilkington]

My recent posts were about 'just in case' precautions before a system 
upgrade.  I now appear to have a working upgraded system.  It wasn't 
trouble-free and I didn't use the live workstation download.


The system uses the rpmfusion nvidia 470xx video drivers, which build 
modules locally via akmods.  Booting the F38 system with the 
kernel-6.5.6-200.fc38 did not complete, but kernel-6.5.6-100.fc37 seemed 
fine.


Eventually, running the F37 kernel, I "sudo dnf reinstall"ed all the 
rpmfusion 470xx packages *and* the kernel*6.5.6-200.fc38 packages and 
waited for the jobs to complete.  Booting to F38 seems ok now.  The 
problems were similar to, but worse than, those seen in earlier 
upgrades.  There's a related bugzilla.


https://bugzilla.redhat.com/show_bug.cgi?id=2011120

John P
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Scanner works!

[Tom Horsley]

In the past I have had near infinite trouble getting scanners
compatible with linux, but I just replaced a dead Epson multi-function
device that I only ever used as a scanner with a Canoscan LIDE 300
and was shocked and amazed when it just worked out of the box.

P.S. The epson isn't quite as bad as HP forbidding you from using
the scanner if it is out of ink, but it finally decayed to the
point that it decided there were errors with the ink cartridges,
and nothing would allow it to use the scanner after that.
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Re: Upgrading to Fedora 38: Misleading 'verify' instructions

[George N. White III]

On Sat, Oct 14, 2023 at 8:57 PM Dave Close  wrote:

> Barry Scott wrote:
>
> >What exactly did you do that got this error message?
> >How can I reproduce this?
>
> To me, the first important question is, is the file actually defective
> (17 improperly formatted lines) or is the message bogus?
>

The file is ASCII text and should contain a comment line and a 16-line PGP
signature block, which
are clearly not properly formatted checksum lines.
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vnc/remmina

[Patrick Dupre]

Hello,

I can connect to a remote machine (fedora 38) via vnc or remmina (ssh or vnc)
but I just have black screen.

Here is my ~/.vnc/xstartup

#!/bin/sh

unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
#exec /etc/X11/xinit/xinitrc
gnome-session --session=gnome-classic &


I also tried both
exec /etc/X11/xinit/xinitrc

but same behavior.

What did I miss?

Thank.

===
 Patrick DUPRÉ | | email: pdu...@gmx.com
 Laboratoire interdisciplinaire Carnot de Bourgogne
 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
===
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Re: Upgrading to Fedora 38: Misleading 'verify' instructions

[John Pilkington]

On 15/10/2023 01:23, Jonathan Billings wrote:

On Oct 14, 2023, at 14:06, John Pilkington  wrote:


I have done several system upgrades in the past.  This time I thought 
I would take the suggested precautions and download the workstation .iso


On trying to verify the download, using

https://fedoraproject.org/en/workstation/download/

I got a report that "17 lines are improperly formatted".  So I worried 
and did it again.  Same result.


This is BZ 733561, opened in 2011 and NOTABUG.  Isn't it time that 
this was mentioned in the 'helpful' warning suggestion?


I agree that the wording in the instructions could be better.

The CHECKSUM file has a GPG signature and the sha256sum of ISO, so the 
sha256sum command will give a warning that there are improperly 
formatted lines (the GPG signature). But, as the instructions say: “If 
the output states that the file is valid, then it's ready to use!”


That's fine.  But the response doesn't say that the file is valid, only 
that there is a formatting problem.  The documentation is misleading, 
and has been for years.


It would be nice if there was a way to make sha256sum ignore the GPG 
key, but you should:


1.) make sure the GPG signature is valid.
2.) look to see if it says the file you downloaded is OK and ignore the 
warning about improperly formatted lines, since you know from the 
previous step that those lines are ok.


--
Jonathan Billings


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