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I'm seeking for a circuit simulator for Ubuntu 16.04

Based on experience on using a few, here are my recommendations based on the link @P05TMAN suggested and can be easily found on the Ubuntu Software Store.

• Icarus Verilog


• Eagle

Although these are more on the intermediate/advanced level, they allow you to do more complex operations and design but requires some background and knowledge of the software/language.

Looks like Qucs is what's recommended in the UbuntuEngineering wiki:

https://help.ubuntu.com/community/UbuntuEngineering

It's stated to be available in the Ubuntu Software Center

Using apt search circuit, we can get a list of available packages that contains the word "circuit" somewhere in their description. I picked a few (11) candidates of that list which seemed most relevant to me and copied their descriptions from apt show PACKAGENAME here:

cl-rlc/xenial,xenial 0.1.3-3 all

  Common Lisp RLC Circuit Simulator



Description: Common Lisp RLC Circuit Simulator

 cl-rlc provides a simulator for RLC (resistance, inductance, capacitance)

 circuits. It is written in Common Lisp and uses the xgraph package for

 plotting.





eagle/xenial 6.6.0-2 i386

  Printed circuit board design tool



Description: Printed circuit board design tool

 Eagle includes a layout editor, schematic editor, and an autorouter. The

 following limitations apply to the EAGLE Light Edition: The usable board

 area is limited to 100 x 80 mm (4 x 3.2 inches). Only two signal layers

 can be used (Top and Bottom). The schematic editor can only create one

 sheet.

 .

 Use of eagle freeware is limited to non-profit or evaluation purposes. See

 /usr/share/doc/eagle/copyright for more information.





electric/xenial,xenial 9.06+dfsg-1 all

  electrical CAD system



Description: electrical CAD system

 Electric is a sophisticated electrical CAD system that can handle many

 forms of circuit design, including custom IC layout (ASICs), schematic

 drawing, hardware description language specifications, and electro-

 mechanical hybrid layout.





fritzing/xenial 0.9.2b+dfsg-3 amd64

  Easy-to-use electronic design software



Description: Easy-to-use electronic design software

 Fritzing is an open source project designed to help one transition from a

 prototype to a finished project. Aimed at users who want to produce or

 document circuits and experiments, one starts by building a physical

 prototype, then recreating it with Fritzing’s graphical editor. From there

 one can generate a schematic, PCB artwork, and PCB production files.





geda/xenial,xenial 1:1.8.2-5 all

  GPL EDA -- Electronics design software (metapackage)



Description: GPL EDA -- Electronics design software (metapackage)

 The gEDA project has produced and continues working on a full GPL'd suite

 and toolkit of Electronic Design Automation tools. These tools are used

 for electrical circuit design, schematic capture, simulation, prototyping,

 and production. Currently, the gEDA project offers a mature suite of free

 software applications for electronics design, including schematic capture,

 attribute management, bill of materials (BOM) generation, netlisting into

 over 20 netlist formats, analog and digital simulation, and printed

 circuit board (PCB) layout.

 .

 This is a metapackage which depends on the components required for a

 typical gEDA installation.





gnucap/xenial 1:0.36~20091207-2 amd64

  GNU Circuit Analysis package



Description: GNU Circuit Analysis package

 GNUCAP is a general purpose circuit simulator.  It performs nonlinear dc

 and transient analyses, Fourier analysis, and ac analysis linearized at an

 operating point.  It is fully interactive and command driven.  It can also

 be run in batch mode or as a server. The output is produced as it

 simulates.  Spice compatible models for the MOSFET (level 1,2,3) and diode

 are included in this release.





gspiceui/xenial 1.1.00+dfsg-1build1 amd64

  Graphical user interface for gnucap and ngspice



Description: Graphical user interface for gnucap and ngspice

 Gspiceui is a graphichal user interface for the two freely available electronic 

 circuit engines: GNU-Cap and Ng-Spice. Current features are:

  * Import gschem schematic files using gentlist.

  * Load and parse circuit description (net list) files.

  * Provides a GUI interface for GNU-Cap OP, DC, AC and Transient analyses and

  generates appropriate simulator commands based on user input.

  * Provides a GUI interface for Ng-Spice DC, AC and Transient analyses and

  generates appropriate simulator commands based on user input.

  * The raw output may be viewed for any processes initiated by gspiceui.





kicad/xenial 4.0.2+dfsg1-4 amd64

  Electronic schematic and PCB design software



Description: Electronic schematic and PCB design software

 Kicad is a suite of programs for the creation of printed circuit boards.

 It includes a schematic editor, a PCB layout tool, support tools and a 3D

 viewer to display a finished & fully populated PCB.

 .

 Kicad is made up of 5 main components:

 .

  * kicad - project manager

  * eeschema - schematic editor

  * pcbnew - PCB editor

  * gerbview - GERBER viewer

  * cvpcb - footprint selector for components

 .

 Libraries:

  * Both eeschema and pcbnew have library managers and editors for their

    components and footprints

  * You can easily create, edit, delete and exchange library items

  * Documentation files can be associated with components, footprints and key

    words, allowing a fast search by function

  * Very large libraries are available for schematic components and footprints

  * Most components have corresponding 3D models





ngspice/xenial 26-1build1 amd64

  Spice circuit simulator



Description: Spice circuit simulator

 NGspice is a mixed-level/mixed-signal circuit simulator. Its code is based

 on three open source software packages: Spice3f5, Cider1b1 and Xspice.

 .

 NGspice is part of gEDA project, a full GPL'd suite of Electronic Design

 Automation tools.





oregano/xenial 0.70-3ubuntu1 amd64

  tool for schematical capture of electronic circuits



Description: tool for schematical capture of electronic circuits

 Oregano is a GNOME application for schematic capture and printing of

 electronic circuits. It can simulate the circuits using Gnucap, ng-spice

 or Berkeley spice.





tkgate/xenial 2.0~b10-4ubuntu2 amd64

  Tcl/Tk based digital circuit editor and simulator



Description: Tcl/Tk based digital circuit editor and simulator

 TkGate is a digital circuit editor and simulator with a Tcl/Tk based

 interface. TkGate includes a large number of built-in devices including basic

 gates, memories, ttys and modules for hierarchical design. The simulator can

 be controlled either interactively or through a simulation script. Memory

 contents can be loaded from files, and a microcode/macrocode compiler (gmac)

 is included to create tkgate memory files from a high-level description. The

 simulator supports continuous simulation, single step simulation (by clock or

 epoch) and breakpoints. Save files are in a Verilog-like format.

 .

 TkGate also includes a number of tutorial and example circuits which can be

 loaded through the "Help" menu. The examples range from a simple gate-level

 3-bit adder to a 16-bit CPU programmed to play the "Animals" game.

 .

 TkGate has a multi-language interface with support for English, Japanese,

 French and Spanish.

Note: I didn't try any of these, just providing a list of candidates that looked promising to me.