I'm seeking for a circuit simulator for Ubuntu 16.04
Looks like Qucs is what's recommended in the UbuntuEngineering wiki:
It's stated to be available in the Ubuntu Software Center
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.
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.
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.
I found it today and tried it out. It works good so far. It runs from desktop in browser like app. I haven't tried to use it offline to see if it works without an internet connection like other similar apps I have on my Ubuntu desktop.