LRZ Sync+Share client installation via APT for Debian/Ubuntu/Mint

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| Setup |
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Instructions:
 1) In releases older than Debian 12 and Ubuntu 22.04, the directory '/etc/apt/keyrings' should be created, if it does not already exist:
      'if [[ ! -d "/etc/apt/keyrings" ]]; then sudo mkdir -pv "/etc/apt/keyrings"; else echo "Directory '/etc/apt/keyrings' exists, it's OK to proceed."; fi'
 2) Import the public key file and store it under '/etc/apt/keyrings', e.g. using the following one-liner:
      'sudo echo "Adding LRZ Sync+Share public key..." && wget -O- https://sasrepo.nas.lrz.de/lrz-sasrepo-signing-gpg-key-g1.asc | gpg --dearmor | sudo tee /etc/apt/keyrings/lrz-syncandshare-archive-keyring.gpg > /dev/null && echo "Saved as:" && ls -l /etc/apt/keyrings/lrz-syncandshare-archive-keyring.gpg'
 3) Create the package source configuration file 'lrz-syncandshare.sources' under '/etc/apt/sources.list.d':
      'sudo echo -e "Types: deb\nURIs: https://deb.sasrepo.nas.lrz.de/stable\nSuites: stable\nArchitectures: amd64\nComponents: main\nSigned-By: /etc/apt/keyrings/lrz-syncandshare-archive-keyring.gpg" | sudo tee /etc/apt/sources.list.d/lrz-syncandshare.sources'
 4) Choose your favorite branch 'stable' (default) or 'testing'.
 5) Create the package preference configuration file 'lrz-syncandshare.pref' under '/etc/apt/preferences.d':
      'sudo echo -e "Package: *\nPin: origin deb.sasrepo.nas.lrz.de\nPin-Priority: 100" | sudo tee /etc/apt/preferences.d/lrz-syncandshare.pref'
 6) Run 'sudo apt-get update'.
 7) To install LRZ Sync+Share client: 'sudo apt install lrz-sync-share'

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| Note |
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Available branches to choose in 'lrz-syncandshare.sources':
 * 'stable': contains the recommended up-to-date client version (default)
 * 'testing': contains the latest available client build (for enthusiasts)

=================
| Last modified |
=================
LRZ Sync+Share Team
2024-05-13

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| Documentation |
=================
doku.lrz.de:
 * https://doku.lrz.de/214-wie-laesst-sich-der-lrz-sync+share-client-mit-apt-installieren-debian-ubuntu-mint-155288705.html?showLanguage=en_US

======================
| Support / Feedback |
======================
LRZ Servicedesk:
 * https://servicedesk.lrz.de/ql/create/106