OpenSSH supports FIDO2 hardware keys for additional protection. The private key
is securely stored on hardware. The file in the ~/.ssh/ directory contains
only the credential id with other non-sensitive meta-data.
Distributions based on Ubuntu have
brltty enabled by default. Some braille
displays do not change the ids of those converters and therefore brltty claims
the serial device and no device file /dev/ttyUSBx is created. In the following
some solutions to this problem are presented.
The zram kernel module creates compressed RAM-based block devices named
/dev/zramX. These zram devices allow fast I/O and the compression provides
RAM space savings.
OEM Windows keys are often stored in the software licensing (SLIC) or Microsoft data management (MSDM) table. When a key is stored the unattended installation can use a generic key and the stored key is than used and activated. The usage of such a key can be tested with QEMU/libvirt.
TrueNAS Scale Cobia (23.10) disabled the option to access VM displays via VNC. The connection method is changed to SPICE.
Sometimes it is necessary to find fonts that contain a specific glyph. The tool albatross can be used for that task.
When using IMAP-based user authentication in applications written in PHP (i.e.
Nextcloud, DokuWiki, etc.), debugging with a test script is essential. The
idea of using curl for authentication, is based on the external user
authentication plugin (see: nextcloud/user_external) of Nextcloud.