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VirtualBox report “Kernel driver not installed” on Fedora 21
ByEric MaVitualBox is installed on Fedora 21 by # yum install VirtualBox The following packages are installed kmod-VirtualBox-3.18.7-200.fc21.x86_64-4.3.20-4.fc21.4.x86_64 VirtualBox-4.3.20-3.fc21.x86_64 There is the kernel modules package installed. However, when running virtualbox (after reboot), it reports: [zma@laptop:~]$ virtualbox WARNING: The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (3.18.7-200.fc21.x86_64) or…
How to merge multiple PDF files to a PDF on Linux?
ByEric Maconvert seems works not very well when merging PDFs. The quality is low. Any other better methods to merge multiple PDF files to a single PDF on Linux? ghostscript works the best for me on merging PDFs: gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile=out.pdf in1.pdf in2.pdf in3.pdf merges in{1..3}.pdf to out.pdf. Read more: How…
How to use different keys for different git servers?
ByQ AI have access to different git servers. I have several keys for these servers. How to use different keys for different git servers? Use the .ssh/config file to specify different configuration for different SSH servers used by git: For example: Host git.example.org Port 22111 IdentityFile ~/.ssh/id_rsa.git.example.org Host code.example.org Port 22 IdentityFile ~/.ssh/id_rsa.code.example.org which specifies the…
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`readlink -m` equivalent function in Python to get canonical file name
ByQ Areadlink -m can get canonical file name by resolving every symlinks in every component of the given path recursively. In Python, the os.readlink() function does not do so. Any equivalent function in Python to the readlink -m command line? Specifically, it does: canonicalize by following every symlink in every component of the given name recursively,…
How to edit eps file?
ByEric MaI have made some eps figures for my paper but now I wanna modify them. How to edit them now? You may try inkscape on Linux: https://inkscape.org/en/ It can edit eps files. Read more: How to make eps files using gnuplot How to Convert JPG Images to EPS An Online JPG to EPS Converter How…
How to set up HP printer drivers on Linux Mint?
ByEric MaHow to set up the driver for an HP printer on Linux Mint or Ubuntu? First install the packages: sudo aptitude install hplip hplip-gui Then run sudo hp-setup and follow the GUI instructions to set up the printer. Read more: How to install drivers for TL-WN725N v2 USB wireless adapter on Fedora 19 HP Printer…
