System upgrade from Ubuntu 18.04 to 20.04 stops part-way through.

[Georges Rodier]

"Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'."

I did uncheck my two ppa in my upgrade sources but still get the above error message.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 29 14:33:52 2020
InstallationDate: Installed on 2020-09-04 (25 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-29 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

Could you please try re-installing the ubuntu-desktop package via the command line and then try the upgrade again? Thanks!

[Georges Rodier (georges-rodier)]

Dear Brian,

Two questions. What do you mean by "the ubuntu-desktop package"? Do you
mean the iso I downloaded for Ubuntu 18.04? And, if so, in what format?
Iso?

Second, where might I get directions on just how to install the package
from the command line. By command line I take it you mean a terminal
where I might use sudo as the first word.

Hopfully,

George Rodier

On 2020-09-30 4:11 p.m., Brian Murray wrote:
> Could you please try re-installing the ubuntu-desktop package via the
> command line and then try the upgrade again? Thanks!
>
> ** Changed in: ubuntu-release-upgrader (Ubuntu)
> Status: Confirmed => Incomplete
>

[Georges Rodier (georges-rodier)]

Brian, by ubuntu-desktop package, do you mean

ubuntu-release-upgrader-core ?

And, if so, where to I find that?

George

On 2020-09-30 4:11 p.m., Brian Murray wrote:
> Could you please try re-installing the ubuntu-desktop package via the
> command line and then try the upgrade again? Thanks!
>
> ** Changed in: ubuntu-release-upgrader (Ubuntu)
> Status: Confirmed => Incomplete
>

[Brian Murray (brian-murray)]

On Thu, Oct 01, 2020 at 01:05:17AM -0000, Georges Rodier wrote:
> Dear Brian,
>
> Two questions. What do you mean by "the ubuntu-desktop package"? Do you
> mean the iso I downloaded for Ubuntu 18.04? And, if so, in what format?
> Iso?
>
> Second, where might I get directions on just how to install the package
> from the command line. By command line I take it you mean a terminal
> where I might use sudo as the first word.

Please run the following in a terminal:

sudo apt-get install ubuntu-desktop

--
Brian Murray

[Georges Rodier (georges-rodier)]

Hi Brian,

Did so:

bash: /etc/profile.d/vte.sh: No such file or directory
george@Leysin:~$ sudo apt-get install ubuntu-desktop
[sudo] password for george:
Reading package lists... Done
Building dependency tree
Reading state information... Done
ubuntu-desktop is already the newest version (1.417.5).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
george@Leysin:~$ ^C
george@Leysin:~$

  What I do find strange is that last evening I upgraded an older (2005)
PC which had xubuntu 18.04 to 20.04 with no real difficulty. Yes, it
never did stop searching for files to remove (in preparation for Clean
UP), so this morning I just turned it off and rebooted. Then I ran the
three apt commands, update, upgrade, and autoremove. That PC now runs
xubuntu 20.04 just fine.

George

On 2020-10-01 1:27 p.m., Brian Murray wrote:
> On Thu, Oct 01, 2020 at 01:05:17AM -0000, Georges Rodier wrote:
>> Dear Brian,
>>
>> Two questions. What do you mean by "the ubuntu-desktop package"? Do you
>> mean the iso I downloaded for Ubuntu 18.04? And, if so, in what format?
>> Iso?
>>
>> Second, where might I get directions on just how to install the package
>> from the command line. By command line I take it you mean a terminal
>> where I might use sudo as the first word.
> Please run the following in a terminal:
>
> sudo apt-get install ubuntu-desktop
>
> --
> Brian Murray
>

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]

[Georges Rodier (georges-rodier)]

Strange that this problem's status has been changed to Incomplete - Expired because YOU FOLKS have DONE NOTHING TO SOLVE IT!!!!!!!

[Brian Murray (brian-murray)]

It is not enough to uncheck the PPAs in your upgrade sources as that leaves the packages installed on your system. The libsane packages from the SANE ppa are causing your failure to upgrade. You'll want to re-enable the sources and then use the package ppa-purge to restore the official Ubuntu package versions and disable the PPAs. After that the upgrade should be calculatable.