Fixes problems cause by micosoft making .NET natively available on Ubuntu 22.04. For more information, refer to https://github.com/dotnet/core/issues/7699.

dotnet-sdk-not-found.bash

#!/bin/bash
#
# Fixes problems caused by micosoft making .NET natively available on Ubuntu 22.04. For
# more information, refer to https://github.com/dotnet/core/issues/7699.
#
# NOTE:
#   This script specifically install dotnet-sdk-6.0 on Ubuntu 22.04 and Linux Mint 21.
#   If you are using a different version of Linux and/or dotnet-sdk, you may need to
#   manually modify the script to suit your needs.
#
# Version: v1.0.0
# License: MIT License
#          Copyright (c) 2022-2024 Hunter T. (StrangeRanger)
#
########################################################################################
####[ Global Variables ]################################################################


## Modify output text color.
C_YELLOW="$(printf '\033[1;33m')"
C_GREEN="$(printf '\033[0;32m')"
C_RED="$(printf '\033[1;31m')"
C_NC="$(printf '\033[0m')"
readonly C_YELLOW C_GREEN C_RED C_NC

## Identify distro and distro version.
if [[ -f /etc/os-release ]]; then
    # shellcheck disable=SC1091
    . /etc/os-release
    readonly C_DISTRO="$ID"
    readonly C_VER="$VERSION_ID"  # Version: x.x.x...
    readonly C_SVER=${C_VER//.*/}  # Version: x
else
    C_DISTRO=$(uname -s)
    C_VER=$(uname -r)
    readonly C_DISTRO C_VER
fi

## Identify bit and architecture type.
case $(uname -m) in
    x86_64) readonly C_BITS="64" ;;
    i*86)   readonly C_BITS="32" ;;
    armv*)  readonly C_BITS="32" ;;
    *)      readonly C_BITS="?" ;;
esac


####[ Functions ]#######################################################################


####
# Ensure that .NET is set up to work with 'packages.microsoft.com'.
custom_dotnet() {
    if (hash dotnet &>/dev/null && [[ $(dotnet --version) ]]) &>/dev/null; then
        echo "${C_YELLOW}.NET runtime and .NET SDK seem to both be installed${C_NC}"
        read -rp "Would you like to continue anyways? [y/N] " choice
        choice="${choice,,}"

        case "$choice" in
            y*) ;;
            *)  echo "Exiting..."; exit 0 ;;
        esac
    elif (hash dotnet &>/dev/null && [[ ! $(dotnet --version) ]]) &>/dev/null; then
        echo "${C_YELLOW}While the .NET runtime is installed, the .NET SDK is not${C_NC}"
    else
        echo "${C_YELLOW}Neither .NET runtime or .NET SDK are installed. There is" \
            "nothihg to fix.${C_NC}"
        echo "Exiting..."
        exit 0
    fi

    echo "Uninstalling existing .NET Core 6.0 installation..."
    sudo apt remove dotnet-sdk-6.0 -y
    sudo apt autoremove -y

    if [[ ! -f /etc/apt/preferences.d/custom-dotnet.pref ]]; then
        echo "Upating prefered .NET Core install method..."

        {
            echo -e "Explanation: https://github.com/dotnet/core/issues/7699" \
                "\nPackage: *" \
                "\nPin: origin \"packages.microsoft.com\"" \
                "\nPin-Priority: 1001" | sudo tee /etc/apt/preferences.d/custom-dotnet.pref
        } || {
            echo "${C_RED}Failed to create" \
                "'/etc/apt/preferences.d/custom-dotnet.pref'${C_NC}" >&2
            exit 1
        }
    fi

    echo "Reinstalling .NET Core..."
    # shellcheck disable=SC2015
    sudo apt-get update \
        && sudo apt install dotnet-sdk-6.0 -y \
        || {
            echo "${C_RED}Failed to reinstall .NET Core${C_NC}"
            exit 1
        }

    echo "${C_GREEN}Done${C_NC}"
}


####[ Main ]############################################################################


echo -n "We will now fix 'No .NET SDKs were found'. "
read -rp "Press [Enter] to continue."

if [[ $C_BITS = 64 ]]; then
    if [[ $C_DISTRO = "ubuntu" ]]; then
        case "$C_VER" in
            22.04) custom_dotnet ;;
        esac
    elif [[ $C_DISTRO = "linuxmint" ]]; then
        case "$C_SVER" in
            21) custom_dotnet ;;
        esac
    else
        echo "${C_YELLOW}Your operaring systme version doesn't seem to need this fix"
        echo "WARNING: By continuing, you accept that unexpected behaviors may occur${C_NC}"
        read -rp "Would you like to continue anyways? [y/N] " choice
        choice="${choice,,}"

        case "$choice" in
            y*) custom_dotnet ;;
            *)  echo "Exiting..."; exit 0 ;;
        esac
    fi
fi