cinnamon settings don't open

[qiray]

 * Cinnamon 4.0.8
 * Distribution - Mint 19.1
 * Pitcairn XT [Radeon HD 7870 GHz Edition], Radeon driver
 * 64 bit
 ```

**Issue**

cinnamon-settings don't start after upgrading to Cinnamon 4

**Steps to reproduce**

Upgrade to Mint 19.1 from Mint 19 using these commands.

```bash
sudo apt update && sudo apt upgrade
sudo sed -i 's/tara/tessa/' /etc/apt/sources.list 
sudo sed -i 's/tara/tessa/' /etc/apt/sources.list.d/official-package-repositories.list
sudo apt update && sudo apt upgrade
sudo apt-get dist-upgrade

Then open Cinnamon session and try to open settings panel. Terminal output:

  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 619, in <module>
    window = MainWindow()
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 247, in __init__
    for module in modules:
  File "/usr/share/cinnamon/cinnamon-settings/modules/cs_desktop.py", line 6, in <module>
    gi.require_version('Nemo', '3.0')
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 130, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Nemo not available

Expected behaviour

I expect settings panel to work.

Other information

File cs_desktop.py has line:

gi.require_version('Nemo', '3.0')

Is it correct for cinnamon 4? Commenting this line makes settings work.

xsession-errors.log

[jaszhix]

Was nemo uninstalled? You're supposed to upgrade through the update manager. It might have been removed during the upgrade.

[qiray]

@jaszhix Nemo was updated too. It has version 4 now.

[jaszhix]

Check if gir1.2-nemo-3.0 is at 4.0.6. 3.0 is the correct typelib version.

[qiray]

Well, I installed gir1.2-nemo-3.0 and it works now.

[LinuxOnTheDesktop]

I'm getting the same error, after upgrading some packages with

pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U

The problem:

$  cinnamon-settings
Traceback (most recent call last):
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 619, in <module>
    window = MainWindow()
  File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 247, in __init__
    for module in modules:
  File "/usr/share/cinnamon/cinnamon-settings/modules/cs_backgrounds.py", line 5, in <module>
    import imtools
  File "/usr/share/cinnamon/cinnamon-settings/bin/imtools.py", line 623, in <module>
    if Image.VERSION == '1.1.7':
AttributeError: module 'PIL.Image' has no attribute 'VERSION'

The following did not seem to help.

sudo apt install gir1.2-nemo-3.0 --reinstall

EDIT: the bit of commenting-out recommended on #8266 did not work either. I will try what is recommended in #8495, and await the arrival via Update Manager of the fix (patch) mentioned on that page.

[JosephMcc]

@LinuxOnTheDesktop there is a fix on git master for this at the moment: https://github.com/linuxmint/cinnamon/commit/c843f3664064742e2672e0fea528571a882d84ad

[LinuxOnTheDesktop]

Yes, that is part of what I meant. But I take it that the fix has not been deployed. What I was going to do (as I tried to say above) was to manually apply that fix to my system, i.e. to alter, on my computer, the relevant .py file myself. Now, in the meantime, I _did_ do that. And it works.

Thanks.

[Odyseus]

Hello, everybody.

Edit: The following statement might not be true in newer versions of pip. So, ignore it.

@LinuxOnTheDesktop: You should never use pip as you did to upgrade your global Python modules (except maybe on alpha distributions like Fedora or ArchLinux). pip will upgrade all Python modules, whether they were installed through pip or through apt. pip packages are always in their latest versions, whereas apt packages are feature frozen.

[LinuxOnTheDesktop]

@Odyseus

Thanks. However, when I ran the command that I posted, some of the output said, in effect: 'you've installed this via apt, so we'll leave it alone.' [EDITED: inserted quotation marks, for clarity.]

[Odyseus]

@LinuxOnTheDesktop: Oh, good to know. It must be a new improvement on pip's side. What I wrote before is based on my own experience from a couple of years ago. Luckily, in my case, I just had to reinstall a couple of Python modules (some through pip and some through apt).

Anyway, thanks for the info, LinuxOnTheDesktop. And sorry for the off-topic, everybody.

[smurphos]

There's a few reports of this popping on the Mint Forum - various Cinnamon versions. Hopefully https://github.com/linuxmint/cinnamon/commit/c843f3664064742e2672e0fea528571a882d84ad will be rolled out and will perhaps be a candidate for a maintenance patch for older Cinnamon versions?

[rt3norio]

I had this same problem after installing cinnamon in a MATE 19.1.
gir1.2-nemo-3.0 solved the problem

[MoatazAbdAlmageed]

sudo apt-get install gir1.2-nemo-3.0