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Ubuntu Linux | 2021-04-16

JavaFX DPI Scaling Factor on Ubuntu (20.04)

JavaFX 11 has a bug that ignores the scaling factor on Gnome on Ubuntu. This res ...

Lothar Braun
1 min read
| 2020-10-06

Block Google Cookie Consent with uBlock

Update: Added additional filters to block the “Please Log In” popup at YouTube. Opt ins to cookies have become a very annoying issue if you have your browser configured to remove cookies often. Your consent to all the necessary cookies are stored in a cookie. If you, like me, configured your browser to remove cookies after close or are su ...

Lothar Braun
3 min read
ubuntu linux | 2020-07-15

Scaling JabRef for High DPI

JabRef is a nice utility to manage your paper references. Using it on a high resolution screen, however, can be tedious as it does not automatically adjust its scaling to the used DPI. Below you can find an example for screen resultion of 3840 x 2160: That doesn’t make working with the UI very comfortable. In order to fix this, you ne ...

Lothar Braun
3 min read
ubuntu virtualbox | 2020-04-19

Auto-Resize Display for Windows 10 Guests on Ubuntu 20.04 Hosts

Stock installations of Windows 10 in VirtualBox on Ubuntu systems do not allow to automatically scale the display to the host resolution. Especially if you have a display with a high resolution, such as 3480x2160, you might have to do some configuration tweaking to get this feature going. The number of steps can depend on the configurati ...

Lothar Braun
7 min read
emacs | 2020-04-03

Spell Checking in Emacs using File-Specific Language Settings

Emacs provides functionality to perform spell-checking using ispell. If all files are edited in the same language, it is sufficient to have a global language configuration for the ispell process. Some people however have the need to edit languages in two or more languages. Switching between the languages manually can lead to frustration ...

Lothar Braun
3 min read
ubuntu linux | 2020-03-09

Umlauts on US Keyboard Layouts on Ubuntu with XKB

Xmodmap had been a reliable tool to bring umlauts to the US keyboard layout. However, on modern Ubuntu systems, xmodmap can result in several problems and does no longer work reliably. Using XKB, it is possible to define own layouts that work more reliably. Being able to activate them, seems to change amongst Ubuntu version. Several recom ...

Lothar Braun
4 min read
ubuntu linux nvidia | 2020-02-23

NVIDIA Power Saving on Ubuntu 18.04

Ubuntu 18.04 does not enable power saving for NVIDIA graphic cards by default. The card will be power-on, even if a secondary graphics chip is the active graphics card. If you selected sudo prime-select intelto ensure that your Intel graphics card is active, then the NVIDIA card will not be disabled. You can use tools like bumblebee to ...

Lothar Braun
3 min read
linux python | 2020-01-19

SMTP Debugging Server in Python

Python’s built-in smtpd was a simple and usable mail server for testing purposes. A simple cli call such as: python3 -m smtpd -n localhost:2525was sufficient to receive your debugging emails. However, there are some problems currently piling up, which are ignored by the python devs. I recently stumbled over the following problem: $ python ...

Lothar Braun
2 min read
linux | 2019-11-28

GitLab Error 502 After Update

GitLab wants to be updated on a regular basis. Most of the time, this update is painless. It happens sometimes that the update / upgrade does not work expected and the user is greeted with a 502 error: Such an error can often be removed by reconfiguring the GitLab instance. Stop the GitLab server first sudo gitlab-ctl stopPerform the au ...

Lothar Braun
1 min read
linux | 2019-11-28

Forcing IPv4 on OpenVPN Client

Some OpenVPN configurations contain servers that have a IPv6 DNS record configured, but actually do not support establishing connections via IPv6 (e.g. because of a firewall filtering rule). A configuration as shown below can lead to problems: proto udp remote <hostname.somedomain.com>The above configuration lines ask the OpenVPN cl ...

Lothar Braun
3 min read
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