Method not found: RandomNumberGenerator.GetBytes(Byte[], Int32, Int32)

hit this error on windows 7 pc.


according to msdn,


this api was introduced in .NET Framework Available since 4.6

Im currently using .NET Framework 4.5.


fix is to upgrade .NET Framework.

xfce4-pulseaudio-plugin replace xfce4-mixer on EL7

Env: Oracle Linux Unbreakable 7 XFCE

It was running xfce4-mixer as old style audio adjusting way.

replacing is not a easy way even that pluseaudio was involved early as 2008.

cleanup all standalone installation which is xfce deps, such as im-chooser-xfce4.

then  # yum install pluseaudio-plugin
which will erase xfce4-mixer as expected.

after that,

Rebuild:  pavucontrol-3.0-6.el7.src.rpm


Incase you can’t Dual-boot Fedora24/windows UEFI

Hardware: Thinkpad T420
UEFI enabled only.

Disk 1: Windows 7
Disk 2: Fedora 24

Cannot boot Windows 7 entry on Linux Grub2 item list.



T460s 做到了fc24/win10 用grub2双启, 但t420却不行。





Block all grub2-* packages excluded by dnf update.



Windows 7 and Fedora 24 dual boot on (U)EFI system – what are the issues here, where is it documented?

After updating Fedora23 to 24 my Windows/UEFI does not start.

Dual booting Windows fails with ‘relocation failed’ error on some UEFI systems

Bug 1347291 – Booting from Windows 10 entry ends with ‘relocation failed’ error

/lib/ bad ELF interpreter: No such file or directory

1. ready to install oracle 10g on OracleLinux 7.

2. runInstaller, hit failed: /lib/

3. solution:

# yum install /lib/

it’s outside the scope of:

oracle-rdbms-server-11gR2-preinstall-1.0-4.el7.x86_64.rpm 14-Oct-2015 06:24 18.9 K
oracle-rdbms-server-12cR1-preinstall-1.0-4.el7.x86_64.rpm 14-Oct-2015 06:18 17.7 K

copy pyenv installation onto other nodes

the step Im working on copying pyenv installation.

seems it’s simple, after setting env. it failed.

the problem is :


well after checking, it was the problem that ~/.pyenv/libexec was not in the $PATH.

comparing the src and dest env.:

the problem is that pyenv is now a binary, not instead.

1. using zip -y or –symlinks option on backup.
2. or after unzip, remove pyenv binary under ~/.pyenv/bin/, install sym-link.