hitchcock.dev

Thoughts, projects, tips and ideas.

Sorry, something went wrong: Ubuntu Software Center

Ubuntu software center on 20.04 kept throwing an error today and wasn't working. To resolve simply kill the process in your system monitor.

  • Open system monitor and select the processes tab
  • Search for snap-store and then hit end process
  • Re-open Ubuntu Software Center.

I'm not sure why this was an issue but app installations and updates began working after I killed the process.

Update entity framework on Ubuntu 18.04

The EF Core tools version '3.1.1' is older than that of the runtime '3.1.4'. Update the tools for the latest features and bug fixes.

In order to update EF Core tools on Ubuntu 18.04 from the terminal simply run the following  command: 

dotnet tool update --global dotnet-ef

Installing .NET Core SDK on Ubuntu 20.04 LTS

I'm typically an early adopter of new Ubuntu LTS releases and as such I reformatted my laptop with the release hoping to get going with .NET Core right away but the posted install guide on Microsoft docs didn't work. I went back to the docs a few days later and found that the guide had been pulled. After weeks of waiting we finally got an update today! The packages should be available on 5/12/2020 (only 2.5 weeks after the LTS dropped, 🎉 great job Microsoft!)

There are several workarounds for anyone that needs to use the SDK immediately. Check them out here.

UPDATE 5/13/2020: The Ubuntu packages are live and the dependencies issues yesterday were resolved. Here's how to get it going until Microsoft updates their documentation. 

wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install apt-transport-https
sudo apt-get update
sudo apt-get install dotnet-sdk-3.1
Dotnet-sdk-3.1 Ubuntu 20.04 installation steps

If you had previous failed attempts you may have to purge old sources.

sudo dpkg --purge packages-microsoft-prod && sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update

The power of Control-R in Ubuntu

If you're anything like me in the terminal you're continuously using the up arrow to look back through commands. Today I found that if you hold the CTRL key then press R it will load the previous command search (I use Ubuntu 20.04 LTS). Start typing and if the command you want is shown press enter to execute. If this is not the correct command press CTRL-R to search back further. If you do not want to execute just hit CTRL-C to cancel.

reverse-i-search

Hint - this is based on your HISTSIZE setting. The default on my system is 500 which is fine for my purposes.

How to mount QNAP file share with fstab on Ubuntu 18.04

  1. Create a mount location on your Ubuntu host.
sudo mkdir /media/<sharename>

2. Create a credentials file (I created mine at /media/nfs-credentials with sudo touch /media/nfs-credentials and put the following lines in the file.

username=<shareusername>
password=<sharepassword>

Edit /etc/fstab and add a line at the bottom being careful not to edit any lines that already exist.

//<share_ip>/<sharename> /media/<sharename> cifs uid=0,credentials=/nfs/nas-credentials,iocharset=utf8,noperm 0 0

Test your mount with the following command:

sudo mount -a

Navigate to /media/<sharename> and you should see the contents of your share.

Your share will automatically mount at system boot from now on.