Pentium D support VT Technology.

Source: Enable VT on 745 for 64 bit virtual machines – Dell Community

I have been converting some of my old VirtualBox images to KVM, which is the virtualization standard in Linux.

Its really easy, although, if you run into booting issues of the converted image, the last tip here will save you some time.

To convert from VirtualBox to KVM, look for your VDI images.

qemu-img convert -f vdi -O qcow2 [VBOX-IMAGE.vdi] [KVM-IMAGE.qcow2]

e.g. qemu-img convert -f vdi -O qcow2 FreeBSD-7.2.vdi FreeBSD-7.2.qcow2

You can now import the converted image using virt-manager or the CLI tool virt-install.

In Virtual Machine Manager, go to Disk 1 >> Advanced options and change ‘Storage format’ to qcow2.

This prevents boot errors like ‘boot failed: not a bootable disk’ when you launch the VM.

Source: Easily convert from VirtualBox to KVM in Linux – Joseph Zikusooka Joseph Zikusooka

Type 1 hypervisors:
1. VMware ESX and ESXi

These hypervisors offer advanced features and scalability, but require licensing, so the costs are higher.

There are some lower-cost bundles that VMware offers and they can make hypervisor technology more affordable for small infrastructures.

VMware is the leader in the Type-1 hypervisors. Their vSphere/ESXi product is available in a free edition and 5 commercial editions.
2. Microsoft Hyper-V

The Microsoft hypervisor, Hyper-V doesn’t offer many of the advanced features that VMware’s products provide.
However, with XenServer and vSphere, Hyper-V is one of the top 3 Type-1 hypervisors.

It was first released with Windows Server, but now Hyper-V has been greatly enhanced with Windows Server 2012 Hyper-V. Hyper-V is available in both a free edition (with no GUI and no virtualization rights) and 4 commercial editions – Foundations (OEM only), Essentials, Standard, and Datacenter. Hyper-V
3. Citrix XenServer

It began as an open source project.
The core hypervisor technology is free, but like VMware’s free ESXi, it has almost no advanced features.
Xen is a type-1 bare-metal hypervisor. Just as Red Hat Enterprise Virtualization uses KVM, Citrix uses Xen in the commercial XenServer.

Today, the Xen open source projects and community are at Xen.org. Today, XenServer is a commercial type-1 hypervisor solution from Citrix, offered in 4 editions. Confusingly, Citrix has also branded their other proprietary solutions like XenApp and XenDesktop with the Xen name.
4. Oracle VM

The Oracle hypervisor is based on the open source Xen.
However, if you need hypervisor support and product updates, it will cost you.
Oracle VM lacks many of the advanced features found in other bare-metal virtualization hypervisors.
Type 2 hypervisor
1. VMware Workstation/Fusion/Player

VMware Player is a free virtualization hypervisor.

It is intended to run only one virtual machine (VM) and does not allow creating VMs.
VMware Workstation is a more robust hypervisor with some advanced features, such as record-and-replay and VM snapshot support.

VMware Workstation has three major use cases:

for running multiple different operating systems or versions of one OS on one desktop,
for developers that need sandbox environments and snapshots, or
for labs and demonstration purposes.

2. VMware Server

VMware Server is a free, hosted virtualization hypervisor that’s very similar to the VMware Workstation.
VMware has halted development on Server since 2009
3. Microsoft Virtual PC

This is the latest Microsoft’s version of this hypervisor technology, Windows Virtual PC and runs only on Windows 7 and supports only Windows operating systems running on it.
4. Oracle VM VirtualBox

VirtualBox hypervisor technology provides reasonable performance and features if you want to virtualize on a budget. Despite being a free, hosted product with a very small footprint, VirtualBox shares many features with VMware vSphere and Microsoft Hyper-V.
5. Red Hat Enterprise Virtualization

Red Hat’s Kernel-based Virtual Machine (KVM) has qualities of both a hosted and a bare-metal virtualization hypervisor. It can turn the Linux kernel itself into a hypervisor so the VMs have direct access to the physical hardware.
KVM

This is a virtualization infrastructure for the Linux kernel. It supports native virtualization on processors with hardware virtualization extensions.

The open-source KVM (or Kernel-Based Virtual Machine) is a Linux-based type-1 hypervisor that can be added to most Linux operating systems including Ubuntu, Debian, SUSE, and Red Hat Enterprise Linux, but also Solaris, and Windows.

VirtualBo

Source: What is Hypervisor and what types of hypervisors are there?

Previously codenamed “Vanderpool”, VT-x represents Intel’s technology for virtualization on the x86 platform. On November 13, 2005, Intel released two models of Pentium 4 (Model 662 and 672) as the first Intel processors to support VT-x. The CPU flag for VT-x capability is “vmx”; in Linux, this can be checked via /proc/cpuinfo, or in macOS via sysctl machdep.cpu.features.[19]

“vmx” stands for Virtual Machine Extensions, which adds ten new instructions: VMPTRLD, VMPTRST, VMCLEAR, VMREAD, VMWRITE, VMCALL, VMLAUNCH, VMRESUME, VMXOFF, and VMXON.[20] These instructions permit entering and exiting a virtual execution mode where the guest OS perceives itself as running with full privilege (ring 0), but the host OS remains protected.

As of 2015, almost all newer server, desktop and mobile Intel processors support VT-x, with some of the Intel Atom processors as the primary exception.[21] With some motherboards, users must enable Intel’s VT-x feature in the BIOS setup before applications can make use of it.

Intel started to include Extended Page Tables (EPT),a technology for page-table virtualization,[24] since the Nehalem architecture, released in 2008. In 2010, Westmere added support for launching the logical processor directly in real mode – a feature called “unrestricted guest”, which requires EPT to work.[27][28]

Since the Haswell microarchitecture (announced in 2013), Intel started to include VMCS shadowing as a technology that accelerates nested virtualization of VMMs.[29] The virtual machine control structure (VMCS) is a data structure in memory that exists exactly once per VM, while it is managed by the VMM. With every change of the execution context between different VMs, the VMCS is restored for the current VM, defining the state of the VM’s virtual processor.[30] As soon as more than one VMM or nested VMMs are used, a problem appears in a way similar to what required shadow page table management to be invented, as described above. In such cases, VMCS needs to be shadowed multiple times (in case of nesting) and partially implemented in software in case there is no hardware support by the processor. To make shadow VMCS handling more efficient, Intel implemented hardware support for VMCS shadowing.
 

Source: x86 virtualization – Wikipedia

Andrew “Tridge” Tridgell (born 28 February 1967) is an Australian computer programmer. He is the author of and a contributor to the Samba file server, and co-inventor of the rsync algorithm.

He has analysed complex proprietary protocols and algorithms, to allow compatible free and open source software implementations.

Source: Andrew Tridgell – Wikipedia

https://bdselectronic.com.mk/

In North America, music appreciation courses often focus on Western art music, commonly called “Classical music“. Usually music appreciation classes involve some history lessons to explain why people of a certain era liked the music that they did. “Appreciation,” in this context, means the understanding of the value and merit of different styles of music. Music appreciation classes also typically include information about the composers, the instruments and ensembles, and the different styles of music from an era. Music appreciation courses are widely available in universities and colleges. Typically, these courses are designed for non-music majors. A significant part of music appreciation courses is listening to recordings of musical pieces or excerpts from pieces such as symphonies, opera arias and concertos. In some music appreciation classes, the class may go out to hear a live musical performance by an orchestra or chamber music group.

https://en.wikipedia.org/wiki/Music_appreciation

Some more useful user-management commands (also limited to local users):

To add a new user you can use:

sudo adduser new_username

or:

sudo useradd new_username

See also: What is the difference between adduser and useradd?

To remove/delete a user, first you can use:

sudo userdel username

Then you may want to delete the home directory for the deleted user account :

sudo rm -r /home/username

^{(Please use with caution the above command!)}

To modify the username of a user:

usermod -l new_username old_username

To change the password for a user:

sudo passwd username

To change the shell for a user:

sudo chsh username

To change the details for a user (for example real name):

sudo chfn username

And, of course, see also: man adduser, man useradd, man userdel… and so on.

To add a user to the sudo group:

usermod -aG sudo username

Source: A command to list all users? And how to add, delete, modify users? – Ask Ubuntu

Larghissimo – very, very slow (24 bpm and under)
Adagissimo – very slowly
Grave – very slow (25–45 bpm)
Largo – broadly (40–60 bpm)
Lento – slowly (45–60 bpm)
Larghetto – rather broadly (60–66 bpm)
Adagio – slowly with great expression[8] (66–76 bpm)
Adagietto – slower than andante (72–76 bpm) or slightly faster than adagio (70–80 bpm)
Andante – at a walking pace (76–108 bpm)
Andantino – slightly faster than andante (although, in some cases, it can be taken to mean slightly slower than andante) (80–108 bpm)
Marcia moderato – moderately, in the manner of a march[9][10] (83–85 bpm)
Andante moderato – between andante and moderato (thus the name) (92–112 bpm)
Moderato – at a moderate speed (108–120 bpm)
Allegretto – by the mid 19th century, moderately fast (112–120 bpm); see paragraph above for earlier usage
Allegro moderato – close to, but not quite allegro (116–120 bpm)
Allegro – fast, quickly, and bright (120–156 bpm) (molto allegro is slightly faster than allegro, but always in its range)
Vivace – lively and fast (156–176 bpm)
Vivacissimo – very fast and lively (172–176 bpm)
Allegrissimo or Allegro vivace – very fast (172–176 bpm)
Presto – very, very fast (168–200 bpm)
Prestissimo – even faster than presto (200 bpm and over)
Source: Tempo – Wikipedia

Source: How can I shorten my command line (bash) prompt? – Ask Ubuntu

This could better be done as

x=”\n”
echo -ne $x

-e option will interpret backslahes for the escape sequence
-n option will remove the trailing newline in the output

PS: the command echo has an effect of always including a trailing newline in the output so -n is required to turn that thing off (and make it less confusing)

This could better be done as x=”\n” echo -ne $x -e option will interpret backslahes for the escape sequence -n option will remove the trailing newline in the output PS: the command echo has an effect of always including a trailing newline in the output so -n is required to turn that thing off (and make it less confusing)

Source: Echo newline in Bash prints literal \n – Stack Overflow