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I tried installing gnome-shell on ubuntu 18.04 LTS. But I got the following error.

Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 gnome-shell : Depends: evolution-data-server (>= 3.17.2) but it is not going to be installed
               Depends: gir1.2-mutter-2 (>= 3.27.91) but it is not going to be installed
               Recommends: ubuntu-session but it is not going to be installed or
                           gnome-session but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Krishna Kanth Yenumula
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  • In the above question the format of warning is ": Depends: (= version) but this-version is to be installed ". And it is 8 years old question. – Krishna Kanth Yenumula Jul 16 '20 at 05:53
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    Did you read the answers? There is a lot of valuable information that i am sure will help in your situation even if the message is not **exactly** the same. Problem is a non-solvable dependency tree (sometimes called dependency nightmare). That usually happens when using a ppa or manually installed packages. – pLumo Jul 16 '20 at 05:59
  • I got similar unmet dependencies error again, while installing `evolution-data-server`. – Krishna Kanth Yenumula Jul 16 '20 at 05:59
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    Try `sudo apt-get -f install` – kashish Jul 16 '20 at 06:08
  • @kashish I tried this before, it did not work. – Krishna Kanth Yenumula Jul 16 '20 at 06:09
  • I tried `apt-get clean`, `apt-get install -f`, `apt-get update` ,`apt-get upgrade` `apt-get dist-upgrade`. Nothing worked. – Krishna Kanth Yenumula Jul 16 '20 at 06:13
  • The packages available for 18.04 meet the requires in your posted message (https://packages.ubuntu.com/search?suite=all&searchon=names&keywords=evolution-data-server for `evolution-data-server`) so you could also check your sources are correct, and read & correct any messages in a `sudo apt -f install` and correct first. (I'd likely `sudo apt update` & look for missing messages, or details there too... and have you run the `sudo apt update` recently... check your mirror is *up-to-date* maybe; ie. read & act on messages) – guiverc Jul 16 '20 at 06:23
  • @guiverc I tried, it did not work. – Krishna Kanth Yenumula Jul 16 '20 at 06:26
  • Did you read my last comment, ie. `sudo apt update` , are the messages appropriate, the requires ones there (your first post implies to me a source is missing and it would show with the `sudo apt update` output, with the required line not being present in output), ie. it reads like a sources issue to me, and `sudo apt update` provides the best data to peruse looking for issues (not just errors; are the appropriate detail lines output as expected? or missing?) – guiverc Jul 16 '20 at 06:34
  • I ran `sudo apt update`, I did not find any problem. – Krishna Kanth Yenumula Jul 16 '20 at 06:39
  • `evolution-data-server` depends on `libcamel-1.2-61`. I removed this and re-installed it. After that I installed `evolution-data-server`. Similarily, `gir1.2-mutter-2` depends on some other package. I removed it, re-installed it. Finally, I am able to install gnome-shell. – Krishna Kanth Yenumula Jul 16 '20 at 11:56

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