Laravel mongodb package installation problem - mongodb

when I am writing this in cmd composer require jenssegers/mongodb or composer require jenssegers/mongodb --ignore-platform-reqs this error is showing:
Using version ^3.6 for jenssegers/mongodb ./composer.json has been
updated Loading composer repositories with package information
Updating dependencies (including require-dev) Your requirements could
not be resolved to an installable set of packages.
Problem 1
Conclusion: don't install jenssegers/mongodb v3.6.3
Conclusion: don't install jenssegers/mongodb v3.6.2
Conclusion: don't install jenssegers/mongodb v3.6.1
Conclusion: remove laravel/framework v5.5.48
Installation request for jenssegers/mongodb ^3.6 -> satisfiable by jenssegers/mongodb[v3.6.0, v3.6.1, v3.6.2, v3.6.3].
Conclusion: don't install laravel/framework v5.5.48
jenssegers/mongodb v3.6.0 requires illuminate/events ^5.8|^6.0 -> satisfiable by illuminate/events[v5.8.0, v5.8.11, v5.8.12, v5.8.14,
v5.8.15, v5.8.17, v5.8.18, v5.8.19, v5.8.2, v5.8.20, v5.8.22, v5.8.24,
v5.8.27, v5.8.28, v5.8.29, v5.8.3, v5.8.30, v5.8.31, v5.8.32, v5.8.33,
v5.8.34, v5.8.35, v5.8.36, v5.8.4, v5.8.8, v5.8.9, v6.0.0, v6.0.1,
v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.10.0, v6.11.0, v6.12.0, v6.13.0,
v6.13.1, v6.14.0, v6.15.0, v6.15.1, v6.16.0, v6.17.0, v6.17.1,
v6.18.0, v6.18.1, v6.18.2, v6.18.3, v6.2.0, v6.3.0, v6.4.1, v6.5.0,
v6.5.1, v6.5.2, v6.6.0, v6.6.1, v6.6.2, v6.7.0, v6.8.0].
don't install illuminate/events v5.8.0|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.11|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.12|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.14|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.15|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.17|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.18|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.19|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.2|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.20|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.22|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.24|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.27|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.28|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.29|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.3|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.30|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.31|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.32|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.33|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.34|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.35|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.36|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.4|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.8|don't install laravel/framework v5.5.48
don't install illuminate/events v5.8.9|don't install laravel/framework v5.5.48
don't install illuminate/events v6.0.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.0.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.0.2|don't install laravel/framework v5.5.48
don't install illuminate/events v6.0.3|don't install laravel/framework v5.5.48
don't install illuminate/events v6.0.4|don't install laravel/framework v5.5.48
don't install illuminate/events v6.1.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.10.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.11.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.12.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.13.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.13.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.14.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.15.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.15.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.16.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.17.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.17.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.18.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.18.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.18.2|don't install laravel/framework v5.5.48
don't install illuminate/events v6.18.3|don't install laravel/framework v5.5.48
don't install illuminate/events v6.2.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.3.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.4.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.5.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.5.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.5.2|don't install laravel/framework v5.5.48
don't install illuminate/events v6.6.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.6.1|don't install laravel/framework v5.5.48
don't install illuminate/events v6.6.2|don't install laravel/framework v5.5.48
don't install illuminate/events v6.7.0|don't install laravel/framework v5.5.48
don't install illuminate/events v6.8.0|don't install laravel/framework v5.5.48
Installation request for laravel/framework (locked at v5.5.48, required as 5.5.*) -> satisfiable by laravel/framework[v5.5.48].
Installation failed, reverting ./composer.json to its original
content.
What am I doing wrong? Laravel version is 5.5 mongoDB version is v4.2.3

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I couldn't upgrade my raspberry pi python version from 3.7 to 3.9

Please help me.
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sudo apt-get upgrade python3
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(file "/user/bin/add-apt-repository", line 95, in )
(sp = SoftwareProperties(options=options)
(....)
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anyone know how to make it to python3.9?
you have to type this in terminal:
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error in installing libpq-dev in ubuntu 14.04 after installing psycopg2

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pip install -r requirements.txt
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Downloading/unpacking psycopg2==2.6 (from -r requirements.txt (line 58))
Downloading psycopg2-2.6.tar.gz (367kB): 367kB downloaded
Running setup.py (path:/tmp/pip_build_root/psycopg2/setup.py) egg_info for package psycopg2
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Complete output from command python setup.py egg_info:
running egg_info
creating pip-egg-info/psycopg2.egg-info
writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
writing pip-egg-info/psycopg2.egg-info/PKG-INFO
writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
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----------------------------------------
Cleaning up...
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Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
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The following information may help to resolve the situation:
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libpq-dev : Depends: krb5-multidev but it is not going to be installed
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E: Unable to correct problems, you have held broken packages.
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sudo apt-get install libssl-dev krb5-multidev comerr-dev
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sudo apt-get update
sudo apt-get install libssl-dev krb5-multidev comerr-dev
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sudo apt-get install comerr-dev
sudo apt-get install libcomerr2
sudo apt-get install comerr-dev
sudo apt-get install comerr-dev
sudo apt-get install 1.42.9-3ubuntu1.3
sudo apt-get install ibcomerr2=1.42.9-3ubuntu1
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pip install -r requirements.txt
Just follow only Steps
sudo apt-get install git
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sudo ./enableDisableDistribution.pl enable updates
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I Fixed issue by those above steps

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Thanks in advance.