Juan Leni's questions

I have a docker container and I want to run an app that requires X11. I want to expose that in the host. This is actually working well in a notebook but fails in a desktop.

More info:

I am launching docker with the correct arguments:

    docker run -it --rm \
    --privileged \
    -e DISPLAY \
    -v /tmp/.X11-unix:/tmp/.X11-unix:ro \
    .... not related options ....
    $(DOCKER_IMAGE) \
    xclock

In a notebook (Ubuntu 19.10) works great BUT when I try the same in a desktop (Ubuntu 19.10), I get Error: Can't open display: :1

There is somehow something different and I cannot find out what the difference is.

I have already:

• Disabled access control xhost +
• There is no ~/.Xauthority file
• No firewall enabled
• Containers are identical (both computers download the image from Dockerhub).
• This is not about SSH at all, so X11 forwarding is not relevant.
• Both computers are using X11 (no wayland involved)

I have noticed that notebook uses :0 and desktop :1 but I don't think that is relevant.

Question: Are there any log files that I could look at? Any tips on debugging the issue?

I have an XPS 13 9380 which was working quite well. In the last few days I cannot boot it anymore. When booting I end up in a white screen with some rubbish in the upper left corner.

I have manage to boot it in safe mode but I cannot work out yet where it is failing when booting in normal mode.

• Are there any known issues in the last week that affect XPS 13?
• any tips for diagnosing this kind of problems?

I am using an Apple Aluminium keyboard.

Keys F1..F18 work well, however, F19 is not recognized.

Actually, when checked with xev, it is recognized.. but I cannot assign a shortcut to F19 in gnome or any other app.

Is this a known issue? any tips on how to fix it?

update: Output from xev when clicking F19

KeyPress event, serial 37, synthetic NO, window 0xd000001,
    root 0x1e6, subw 0x0, time 64297953, (160,-20), root:(1351,629),
    state 0x10, keycode 197 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0xd000001,
    root 0x1e6, subw 0x0, time 64297960, (160,-20), root:(1351,629),
    state 0x10, keycode 197 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

update 2: Output from xev when clicking F18

KeyPress event, serial 37, synthetic NO, window 0xd000001,
    root 0x1e6, subw 0xd000002, time 69242803, (47,44), root:(2043,870),
    state 0x10, keycode 196 (keysym 0x1008ff49, XF86Launch9), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0xd000001,
    root 0x1e6, subw 0xd000002, time 69242806, (47,44), root:(2043,870),
    state 0x10, keycode 196 (keysym 0x1008ff49, XF86Launch9), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

I guess it has something to do with F18=XF86Launch9 and F19=NoSymbol.. where is this mapped?

I have cloned my SSD and rebooted with a Live distro to change the corresponding UUID.

Unfortunately when I run

tune2fs -U {some_UUID} /dev/sda5 

I get the error

tune2fs: Bad magic number ....
/dev/sda5 contains a LVM2_member

This happens for both copies.. so I cannot change the UUID. If I try to book, the system does not start because of the duplicated UUIDs.

How can I change the UUID in this case?

Is it possible to install gnome 3.29.92 or 3.30 in ubuntu 18.04?

Is there a PPA available?

Update: https://mail.gnome.org/archives/devel-announce-list/2018-September/msg00003.html

I have a script that has been working well until now and suddenly I get the following message:

Get:81 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 python-software-properties all 0.96.20.7 [20.7 kB]
Get:82 http://archive.ubuntu.com/ubuntu xenial/main amd64 python3-pycurl amd64 7.43.0-1ubuntu1 [42.3 kB]
Get:83 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 python3-software-properties all 0.96.20.7 [20.3 kB]
Get:84 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 software-properties-common all 0.96.20.7 [9452 B]
Get:85 http://archive.ubuntu.com/ubuntu xenial/main amd64 xz-utils amd64 5.1.1alpha+20120614-2ubuntu2 [78.8 kB]
Err:86 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 unattended-upgrades all 0.90ubuntu0.7
  404  Not Found [IP: 91.189.88.161 80]
Fetched 23.7 MB in 1s (14.8 MB/s)
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/libpython3.5-minimal_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/python3.5-minimal_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/libpython3.5-stdlib_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/python3.5/python3.5_3.5.2-2ubuntu0~16.04.2_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libi/libidn/libidn11_1.32-3ubuntu1.1_amd64.deb  404  Not Found [IP: 91.189.88.161 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/u/unattended-upgrades/unattended-upgrades_0.90ubuntu0.7_all.deb  404  Not Found [IP: 91.189.88.161 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
The command '/bin/sh -c apt-get -y install software-properties-common python-software-properties' returned a non-zero code: 100

It seems that when running:

apt-get -y install software-properties-common python-software-properties

Some server is down. How can I avoid having this dependency? This is part of a continuous integration server and I would like to avoid these problems in the future.

NOTE: I ran sudo apt update before.. This is in fact, part of a Dockerfile:

FROM ubuntu:16.04
RUN apt-get update
RUN apt-get -y install software-properties-common python-software-properties
RUN apt-get -y install ca-certificates curl
RUN apt-get -y install build-essential git sudo

building the container fails in the second line.

I am using:

• Ubuntu 16.04.3 LTS.
• GNOME Shell 3.18.5

Sometimes (1 out of 2) when I log in, the first thing that happens is that something crashes (it seems to be gnome-shell) and all extensions that I had are disabled.

I need to manually go and enable them again.

It looks similar to this problem, but it is not the same: Gnome shell extensions are disabled after reboot

Any tips on what to look for? I hate that it is crashing on log in. I would not mind upgrading gnome if someone provides a reliable/secure PPA.

I am looking for a reliable PPA for cmake backports.

I need it for both Xenial and Trusty (travis-ci). Ideally I would like to have at least cmake 3.8.

Although I know how to tweak here and there..

I wonder if there is any Ubuntu 16.04 (or newer) variant that specializes or works 'out-of-the-box' with HiDPI screens.

For that matter, it would be interesting to know any good and recent Linux distribution that works well with HiDPI...

Update:

Thanks for you answers but I am not looking for a way to adjust my machine. I am aware of these tweaks and I am already using a few of them. My question was more towards which Ubuntu variant (such as Mate, Mint, etc.) handles HiDPI well. For Ubuntu Mate it is part of their roadmap but not there yet. I wonder if there is something already available.

I have read that Eclipse Neon has now support for hidpi but icons are extremely small when using a hidpi notebook in Ubuntu 16.04.

Is there any command line argument or environment variable that I have to set so it works?