user6942: I tried sudo snap install bitcoin-core, which worked but I've read that it cannot be trusted, so I uninstalled it
the developer, bitcoincore.org, doesn't seem to maintain a binary for Ubuntu (or any other distribution) but provides a tar file.  they supply no instructions for how to install the software and I can't seem to find anything simple.  all I want is to install a running node (so there should be a startup script with SysV/InetD/startup, or whatever system Ubuntu is inclined to use now for automatically running services at boot-time)
can anyone point me to a working guide?

user115394: If you want to run bitcoin node on an ubuntu machine, it is always recommend to build it from the source code itself. That way you can be almost 100% sure of its authenticity.
Start with:
sudo apt-get update
sudo apt-get install build-essential software-properties-common
sudo apt-add-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libssl-dev libboost-all-dev libdb4.8-dev libdb4.8++-dev libqt4-dev libminiupnpc-dev libtool libevent-dev automake autoconf pkg-config bsdmainutils
git clone https://github.com/bitcoin/bitcoin
cd bitcoin
./autogen.sh
./configure.ac
make
make install (optional)

After compiling process is completed:
cd src/
sudo cp ./bitcoind /usr/bin/
sudo cp ./bitcoin-cli /usr/bin/
mkdir ~/.bitcoin
nano ~/.bitcoin/bitcoin.conf

Add your RPC user and RPCpassword value in bitcoin.conf file, save, exit.
bitoind -daemon

Your node will start syncing in background.

6942: <p>I tried <code>sudo snap install bitcoin-core</code>, which worked but I've read that it cannot be trusted, so I uninstalled it</p>
<p>the developer, bitcoincore.org, doesn't seem to maintain a binary for Ubuntu (or any other distribution) but provides a tar file.  they supply no instructions for how to install the software and I can't seem to find anything simple.  all I want is to install a running node (so there should be a startup script with SysV/InetD/startup, or whatever system Ubuntu is inclined to use now for automatically running services at boot-time)</p>
<p>can anyone point me to a working guide?</p>
 115394: <p>If you want to run bitcoin node on an ubuntu machine, it is always recommend to build it from the source code itself. That way you can be almost 100% sure of its authenticity.</p>
<p>Start with:</p>
<pre><code>sudo apt-get update
sudo apt-get install build-essential software-properties-common
sudo apt-add-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libssl-dev libboost-all-dev libdb4.8-dev libdb4.8++-dev libqt4-dev libminiupnpc-dev libtool libevent-dev automake autoconf pkg-config bsdmainutils
git clone https://github.com/bitcoin/bitcoin
cd bitcoin
./autogen.sh
./configure.ac
make
make install (optional)
</code></pre>
<p>After compiling process is completed:</p>
<pre><code>cd src/
sudo cp ./bitcoind /usr/bin/
sudo cp ./bitcoin-cli /usr/bin/
mkdir ~/.bitcoin
nano ~/.bitcoin/bitcoin.conf
</code></pre>
<p>Add your RPC user and RPCpassword value in bitcoin.conf file, save, exit.</p>
<pre><code>bitoind -daemon
</code></pre>
<p>Your node will start syncing in background.</p>
