# Unable to open manager after upgrade

**URL:** <https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343>\
**Category:** Uncategorized\
**Created:** [October 12, 2016, 4:11pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343 "2016-10-12T16:11:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![heldeman](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/heldeman/32/20201_2.png) [@heldeman](https://forum.manager.io/u/heldeman)\
**Post date:** [October 12, 2016, 4:11pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343/1 "2016-10-12T16:11:42Z")

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I upgraded today. Manager disappeared. Re-installed Manager. I see and click on the icon. There is no reaction at all. Using Ubuntu 14.04. The “Your topic is similar to…” is not similar.  
I then uninstalled and installed from Manager site. Now clicking on the Manager icon I get this message.

```
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
  at System.Collections.Generic.Dictionary`2[System.Guid,System.Type].get_Item (Guid key) [0x00000] in <filename unknown>:0 
  at ManagerServer.Serialization.GetTypeByGuid (Guid guid) [0x00000] in <filename unknown>:0 
  at ManagerServer.Objects.Get (Guid entityId) [0x00000] in <filename unknown>:0 

```

Thanks  
Pieter

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**Author:** ![aymanjou](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/aymanjou/32/18750_2.png) [@aymanjou](https://forum.manager.io/u/aymanjou)\
**Post date:** [October 12, 2016, 7:13pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343/2 "2016-10-12T19:13:58Z")

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Please search the forum before posting new topic.

This topic will help:

> [@16.10.10 will not start in Kubuntu](https://forum.manager.io/t/16-10-10-will-not-start-in-kubuntu/7304):
>
> I installed the latest 16.10.10 in Kubuntu (14.04) but it won’t start. Here is the output: Unhandled Exception: System.TypeInitializationException: An exception was thrown by the type initializer for \<Module\> ---\> System.TypeInitializationException: An exception was thrown by the type initializer for ank1Ⴍ.ႨႥႣ ---\> System.ArgumentNullException: Argument cannot be null. Parameter name: obj at ank1Ⴍ.ႨႥႣ.Ⴐ () [0x00000] in \<filename unknown\>:0 at ank1Ⴍ.ႨႥႣ..cctor () [0x00000] in \<filename unkn…

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**Author:** ![compuit](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/compuit/32/66_2.png) [@compuit](https://forum.manager.io/u/compuit)\
**Post date:** [October 12, 2016, 7:32pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343/3 "2016-10-12T19:32:22Z")

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Make certain you upgrade **mono** for Ubuntu first.  
See notes here [Ubuntu](https://forum.manager.io/t/installing-server-edition-on-ubuntu-14-04-or-newer/5709)

Here are command lines, in this order.

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF  
echo “deb [Index of /repo/debian](http://download.mono-project.com/repo/debian) wheezy main” | sudo tee /etc/apt/sources.list.d/mono-xamarin.list  
sudo apt-get update  
sudo apt-get upgrade  
**sudo apt-get install mono-devel**  
sudo apt-get install mono-complete

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**Author:** ![lubos](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/lubos/32/62798_2.png) [@lubos](https://forum.manager.io/u/lubos)\
**Post date:** [October 12, 2016, 9:00pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343/4 "2016-10-12T21:00:26Z")

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Where did you download Manager from? The error indicates you’ve installed some older version. Make sure to go to [Download | Manager](https://www.manager.io/desktop/download) and download DEB file for Ubuntu from that page.

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**Author:** ![Ealfardan](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/ealfardan/32/63166_2.png) [@Ealfardan](https://forum.manager.io/u/Ealfardan)\
**Post date:** [January 18, 2023, 3:30pm UTC](https://forum.manager.io/t/unable-to-open-manager-after-upgrade/7343/5 "2023-01-18T15:30:41Z")

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Closed on January 18, 2023, 3:30pm UTC