[Discuss] Ubuntu 22.04 apt-get problem

[bctill]

Hi Znoteer --

Sorry for the delayed reply.  My email went down Sunday afternoon and 
didn't come back up until yesterday evening.

A copy of my /etc/apt/sources.list file is attached.  As for the two 
commands you asked me to run, here are the results:

$ ls -al /etc/apt/sources.d/
ls: cannot access '/etc/apt/sources.d/': No such file or directory

$ sudo apt-cache policy g++ libc6 libc6-dev
g++:
   Installed: (none)
   Candidate: 4:11.2.0-1ubuntu1
   Version table:
      4:11.2.0-1ubuntu1 500
         500 http://ca.archive.ubuntu.com/ubuntu jammy/main amd64 
Packages
libc6:
   Installed: 2.35-0ubuntu3.1
   Candidate: 2.35-0ubuntu3.1
   Version table:
  *** 2.35-0ubuntu3.1 100
         100 /var/lib/dpkg/status
      2.35-0ubuntu3 500
         500 http://ca.archive.ubuntu.com/ubuntu jammy/main amd64 
Packages
libc6-dev:
   Installed: (none)
   Candidate: 2.35-0ubuntu3
   Version table:
      2.35-0ubuntu3 500
         500 http://ca.archive.ubuntu.com/ubuntu jammy/main amd64 
Packages

This makes me wonder if apt-get install g++ is trying to install the 
wrong versions of g++ and/or libc6-dev.  Is it trying to install the 
versions listed under "Candidate"?

On the other hand, maybe I should "downgrade" libc6 to version 
2.35-0ubuntu3.  How would I do that, and how can I determine what, if 
anything, will break if I do that?  Is there a tool that will display my 
entire dependency tree?

By the way, I also tried this:

$ sudo apt install --reinstall libc6
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Reinstallation of libc6 is not possible, since it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I don't know if that gives us a clue or not...

Regards,
-- Bernie.


On 2023-03-26 13:37, Znoteer wrote:
> On Sun, Mar 26, 2023 at 08:56:37AM -0700, bctill wrote:
>> Hi Znoteer --
>> 
>> Good call.  I hadn't thought to try that.  Here's what happens when I 
>> do:
>> 
>> $ sudo apt-get update
>> [sudo] password for user:
> 
> [snip]
> 
>> 
>> However it makes no difference to the apt-get install g++ command.  I 
>> still
>> get the same results.
>> 
> 
> Can you show us your /etc/apt/sources.list and any files in 
> /etc/apt/sources.d/?
> 
> Also, please try running "sudo apt-cache policy g++ libc6 libc6-dev" 
> and show us the output, please.
> 
> And just a note: "apt-get" and just "apt" are very similar programmes. 
> "apt" is newer. Before apt, people used apt-get for interactive use. I 
> am not sure of the details why, but now that the "apt" command is 
> available, the docs recommend using it for interactive use, and 
> "apt-get" for use in scripts.  You'll be okay using apt-get. I just 
> wanted to point out that recommendation and the fact that some people 
> seem to think apt is more user friendly. I don't understand that, but 
> oh well.
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# deb cdrom:[Ubuntu 22.04.1 LTS _Jammy Jellyfish_ - Release amd64 (20220809.1)]/ jammy main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ca.archive.ubuntu.com/ubuntu/ jammy main restricted
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ca.archive.ubuntu.com/ubuntu/ jammy universe
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy universe
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
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deb http://ca.archive.ubuntu.com/ubuntu/ jammy multiverse
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy multiverse
# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
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# deb-src http://ca.archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu jammy-security main restricted
# deb-src http://security.ubuntu.com/ubuntu jammy-security main restricted
deb http://security.ubuntu.com/ubuntu jammy-security universe
# deb-src http://security.ubuntu.com/ubuntu jammy-security universe
deb http://security.ubuntu.com/ubuntu jammy-security multiverse
# deb-src http://security.ubuntu.com/ubuntu jammy-security multiverse

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.