If you use the Google Chrome Browser or Chromium and all Prints over Cups / Cups-PDF or Color Printers are all greyscale there is a known Bug at the Printing Menu of the Browser! This is NOT a Problem with you Cups Printing Setup or Operating System!!! (Alternate you can test your Cups-Printing-System with Firefox here you get color Prints) To fix this you can try to install a other updated PPD Printer Driver which is working with Chrome / Chromium Download here: https://github.com/schlomo/HP-Color-LaserJet-flow-MFP-M880/blob/main/HP-M880-Chrome-Color-Print.ppd then open a Browser to http://localhost:631 go to Printers, change the for example Cups-PDF Printer at new […]
Tag: Bug
Linux Samba User Add Script
Problem: The User Password Sync on Standalone Samba Server like Debian & Ubuntu without LDAP is broken since years! So i wrote a small Script called add-user-smb.sh: #!/bin/bash # Prompt for username read -p "Username: " username # Prompt for password without echoing read -p "Password: " password # Add a new User to Linux sudo useradd -m $username echo "$username:$password"| sudo chpasswd # Add same User to SAMBA Subsystem with same Password! sudo smbpasswd -a $username<<EOF $password $password EOF
Bug: XDM Login Manager fails start on Boot
Seen on ubuntu 22.04 after do-release-upgrade the xdm Login Manager fails to start, cause a old xdm.pid file hangs from last shutdown on “/run/xdm.pid”. XDM prevent start on a old PID File!! Workaround edit Roots crontab to purge it: sudo crontab -e @reboot rm -rf /run/xdm.pid > /dev/null 2>&1 quit and save with “:wq!” ..reboot
Major Bug: Backdoor inside XZ Libs / SSH Backdoor
Brand New: SSH Backdoor seen on Linux XZ-Libs published with Backdoor! Prio HIGH! (The Backdoor offers break out of a SSH Connection) Update your Systems! Read: Article/Post/Backdoor-XZ-SSH Ubuntu Report Debian Report
Ubuntu Upgrade Bug: do-release-upgrade breaks cups wrapper filter files for Brother Laser Printers
If you upgrade ubuntu 18.04 to 22.04 via “do-release-upgrade” and you have installed brother laser printer drivers, the whole “cups” printing system will FAIL on print and log missing “filters” at cups log. The “lp” printer output piped into nirvana! Check at /usr/lib/cups/filter/ for the filter files Reinstalls cups by deinstall/reinstall with –purge config option Check again /usr/lib/cups/filter/ Copy all “brto*” missing filter files from other old working PC to /usr/lib/cups/filter/ Restart PC, cups works now. The Filter files are not inside Brother Driver Packages (deb)! Seen on a Systems with Ubuntu Small/Mini Setup! I will check next days this […]
Bug: virt-manager NO Keyboard input on VM
If you use Debian as Host System for Virtual Servers the “virt-manager” Package is broken! no keymap input no VM Console Control no VT-Switch possible Fix: run sudo virsh edit "vm-name" remove all “spice” display + audio entrys !! open sudo virt-manager go details and and ADD Display VGA + VGA-Adapter select VNC!! save + exit settings.. reboot VM now you should be able to enter the login commands
Ubuntu Debian MAJOR Bug: WIFI randomly disconnected at 100% Signal no internet
Ubuntu Debian (All Linux OS) Bug: WIFI randomly disconnected at 100% Signal no internet System : ubuntu 18.04 LTS Kernel 5.7 amd64 Router openwrt LAN/WIFI: disabled ipv6 dhcp ! Bug: Wifi lost internet connection randomly on 100% Signal beside the Gateway-Router! Problem: No Error Logs, no Kernel Messages Tested: Replaced Mini-PCI WIFI 5/6 Cards various Brands ATH9/Intel no fix!! Replaces Drivers and Power Off Powermanagement of PCI-WIFI! no fix! Solution: edit /etc/sysctl.conf insert: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 Bug Background Info: dhcp6 daemon got a expire time of IP Address but fails to renew the handshake […]
Bug: AVM Router Repeater Mesh Stream Problems
Since latest Updates of AVM Router Firmware the Devices are sold with MESH Option but this FAILS! Background: Mesh should handle the best Connect between Router + Repeater and used Devices Mesh Service produces own Communication Traffic which is added to your default WIFI TRAFFIC! The Repeaters do NOT offer 3 or 4 seperated WIFI NICs for handling the Traffic If you buy new Repeaters look that they have minimum 4 Channels (2,4+5GHZ to Router and 2,4+5GHZ to the Devices like TV,Laptop and more.. If you have LAN Cables next to the Repeaters, you should prefer at the Repeater LAN-to-WIFI […]
WordPress Gutenberg Editor fails on modsecurity2
If you use modsecurity2 Plugin Filter on a Apache2 / Apache24 Setup then on my Blogs Gutenberg fails to SAVE Pages and Drafts. Workaround: Install the old but useful “Classic Editor Plugin” and replace Gutenberg for all Users! Background: It seems the lastest stable mod_security2 Rules not modified for Gutenberg post urls!
Major Bug: UFW stopped thru logrotate
On Debian Sid i have seen that ufw service is stopped on logrotate!! Its a bad known bug! Workaround: Set all Services like Dovecot, Postfix to listen on LOCALHOST (127.0.0.1) if not needed over Internet Enable ONLY encrypted AUTH (Login) to Postfix! (TLS 1.2) Disable unneeded Services ! like Samba, FTP… move config from /etc/logrotate.d/ufw to /root/ to disable ufw logrotate !! edit /etc/ufw/ufw.conf set LOGLEVEL to “off” restart the Server and check open Ports next Days from outside with: $sudo nmap -PN my.server.com
NEXTCLOUD OWNCLOUD BUG FAIL2BAN
FAIL2BAN blocks access to “.ocdata” file! Apache Error Log: ..AH01630: client denied by server configuration: … cloud/data/.ocdata create with a Custom Rule for FAIL2BAN do: $sudo nano /etc/fail2ban/filter.d/apache-auth.local insert: [apache-auth] ignoreregex = nextcloud/data/.ocdata do: $sudo service fail2ban restart Check Log: tail -f n50 /var/log/apache2/error.log Remark: Sometimes the Login take long time after Enter the Password this indicates a filled up “oc_bruteforce_attempts” Table!! login into mysql: $mysql -u user -p select database: USE Nextcloud; show all values from the oc_bruteforce_attempts table, use: SELECT * FROM oc_bruteforce_attempts; remove “ALL” IP’s from the table, do step by step: DELETE FROM oc_bruteforce_attempts WHERE IP="xxx.xxx.xxx.xxx"; […]
Nextcloud Owncloud Calling Home
I did a deeper firewall test on my fresh installed OpenWRT Router and activated a “Ads Blacklist” after this my owncloud Share Login loops! Result: Seems that some IP’s of the “Update Check Tool” Servers, which is installed inside the PHP-Kit is blacklisted. So it seems the Code calls home! With this option its possible to count and collect IPs of Setups! Perhaps checkout unpatched Versions! I didn’t check deeper, but the behavior was clear without viewing the codes. After publish this Info via Twitter: REMARKS: No Company / Developer works for “free” After Setup of PHP-Kits do a […]
WordPress App Bug Role
If you use the wordpress app to publish posts you must set the User Role from Author to Editor, if not you got errors to upload post updates!
Debian Apparmor Bug Kernel
Apparmor has a current bug with the Kernel 4.14 on Debian and seems Ubuntu too, it blocks MySQL and other services from clean run. Bug touches Network Stack of the Kernel
Unity Ubuntu Topbar disappeared
I have often seen that the Unity Topbar of Ubuntu LTS is hidden or not clean loaded after Login. It’s Caching Problem of Unity (Compiz) and Lightdm, if the PC is not clean rebooted or started. Howto fix: sudo rm -fr ~/.cache/compizconfig-1 \ && sudo rm -fr ~/.compiz && sudo service lightdm restart Now relogin and check.. if ok do a Profile Backup! with: tar -cvzf /usb-backup-stick/compiz.tgz \ /home/username/.cache/compizconfig-1 /home/username/.compiz
Linux: Systemd ignore console-setup settings
If you work on older Laptops and you use a Console only System Setup like on Debian there is a Bug on systemd and the console-setup package since years. After reboot all Font Settings seems gone. But the Settings are not real gone, cause systemd does not pull the settings on boot! How to fix? edit the crontab of root by sudo su – crontab -e insert the /bin/setupcon command on “@reboot” means on every boot! @reboot /bin/setupcon > /dev/null 2>&1 save and exit, reboot now now the PC should echo big Fonts for old eyes “Terminus 20×12 Frambuffermode”