SOLVED !
I was trying different ways to solve it, and finally, following your clue about SNAP, I could solve it using the SNAP console way of installation. https://snapcraft.io/install/cura-slicer/ubuntu
sudo apt update
sudo apt install snapd
And:
sudo snap install cura-slicer
Thanks
1
To anyone reading this: if you want to see what's actually relevant to the troubleshooting, scroll down to the bit in bold.
3 hours ago, fjleon said:Snap is used for update packages
Snap is a container format designed to contain a program and all of its dependencies (i.e. the libraries it uses) in a single package to be run in a sandboxed environment for security. It exists to avoid the "dependency hell" problem you can have with Linux, where different programs are programmed with the expected behaviour of different versions of common libraries (shared between all the regular executables - not container formats - on the system) which can potentially break older software if a newer version of the library which deprecates or removes older features is installed.
It is proprietary to Canonical (the company that develops Ubuntu) who host the single repository from which Snap files are distributed, and pretty much the rest of the Linux community hates it and uses the completely open alternative, Flatpak. Even most Linux distributions derived from Ubuntu remove Snap support and include Flatpak support by default.
/\ Rant about Ubuntu and Snaps
\/ Actual troubleshooting BTW I am including information for people not too familiar with Linux.
Anyway, back to my investigations (running Ubuntu in a VM). Annoyed the libfuse2 isn't installed by default so I have to go to the terminal to install that before I can even run an AppImage (it mounts itself in a virtual filesystem and runs there; FUSE is the Linux driver for filesystems in userspace, which allows filesystems to be safely be mounted as required with having access to the kernel).
Running the AppImage from a terminal, keeping a look at the terminal output as it's running, whenever I clicked the button to sign in, this popped up:
mkdir: cannot create directory ‘/run/user/0’: Permission denied
Authorization required, but no authorization protocol specified
Error: cannot open display: :0
I didn't bother to look at the Cura logs, but it's entirely possible it's the same problem. Could be trying to write the verification code there and couldn't. Closed Cura, then on a hunch, pressed up in the terminal. I'd run the AppImage using sudo (SuperUserDo, lets you do anything as the root account which can mess with almost anything on the system; it's there to avoid people having to login as root because in case something bad happens, you want it to happen to just your account, not the whole system).
I actually thought the problem might have been that I ran it as a regular user, and it might need root permission to access those directories - it turns out that because of the way the root account works in an AppImage container, it can't create its own directory there (the 0 is because the root account has the user ID 0).
So I ran Cura as my regular user (no sudo) and the sign in process worked flawlessly. So make sure you're running Cura from an account without superuser privileges. The verification code it's generated is probably trying to be stored in your user folder, which won't work as root.
/\ TL;DR: What worked for me
\/ A couple of minor technical niggles because I like poking technical niggles
1) Trying to access that web server process directly from basically any software you'd run (as opposed to software that contains an API that uses it, as Cura - or a browser which supports OAuth which is what it loads - does) is pretty pointless. A web browser will generally only try to connect on port 443 (HTTPS) then fall back to 80 (HTTP). FTP servers use 20 (data transfer) and 21 (commands) or just 22 (if using Secure FTP). About the only thing that would find it is a port scanner looking for open ports.
2) Trying to access something on your computer using localhost should work in almost any situation, but it's not an iron-clad guarantee - it's just an alias defined in /etc/hosts and redirects to 127.0.0.1 (the IPv4 loopback address). You should probably use 127.0.0.1 (IPv4) or ::1 (loopback address for IPv6) to access your own system.
3) Even with any user facing antivirus or firewalls turned off, there's still lots of services running in the background which could interfere with network traffic. In my fresh install of 22.04 there's netns, inet_frag_ml, watchdogd, ipv6_addrconf, systemd-timesyncd, avahi-daemon, NetworkManager, networkd-dispatcher, wpa-supplicant, ModemManager, systemd-hostnamed and probably some others I don't recognise by name.
1 minute ago, fjleon said:SOLVED !
I was trying different ways to solve it, and finally, following your clue about SNAP, I could solve it using the SNAP console way of installation. https://snapcraft.io/install/cura-slicer/ubuntu
sudo apt update sudo apt install snapdAnd:
sudo snap install cura-slicer
Thanks
Well, if that's what works for you, I'm happy to take the credit 🙂
1
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Slashee_the_Cow 486
Did you install the Snap package for it or a regular package? Both are in the Ubuntu software program, on an application's page at the top right it should tell you its source.
If you downloaded the Snap, then my guess would be that it's because Snap programs are run in a sandbox with very limited access to the rest of the system - I'd be very surprised if it allowed a web server access to the system (I could be wrong, not hugely experienced with Snaps because *twenty minute rant* and that's why I use openSUSE Tumbleweed).
Both versions of Cura in the Ubuntu software repositories are old, anyway (4.13.2 for the Snap and 4.13.0 for the regular package). The best option is to download an AppImage from the Cura homepage.
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fjleon 1
Thanks for your answer.
Snap is used for update packages
Ultimaker-Cura-5-4-0-linux-,modern.AppImage is used and the Ubuntu behaviour is the same.
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