Troubles of Avidemux under Linux Mint 18.3

[uthappam]

Linux Mint 18.3 Sylvia, 32-bit, desktop MATE
Hardware
-Computer-
Processor      : 2x Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz
Memory      : 3090MB (636MB used)
Operating System      : Linux Mint 18.3 Sylvia
-Display-
Resolution      : 1280x1024 pixels
OpenGL Renderer      : Mesa DRI Intel(R) 945GM x86/MMX/SSE2
X11 Vendor      : The X.Org Foundation
-Multimedia-
Audio Adapter      : HDA-Intel - HDA Intel
-Input Devices-
Power Button
Power Button
AT Translated Set 2 keyboard
ImPS/2 Generic Wheel Mouse
-Printers (CUPS)-
HP-LaserJet-1018      : <i>Default</i>
-SCSI Disks-
HL-DT-ST DVDRAM GH24NSD1
ATA ST500DM002-1BD14

[eumagga0x2a]

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Linux Mint 18.3 Sylvia, 32-bit

This explains why the appImage doesn't run: It is 64-bit only.

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Processor  : 2x Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz
Memory     : 3090MB (636MB used)

Your CPU is 64-bit capable, you have enough RAM (but adding at least 1GiB won't harm). You should install a 64-bit operating system. 32-bit Linux software gets zero upstream testing, so escape from that sinking ship ASAP.