Upgrade from 32-bit to 64-bit?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
5882
How to upgrade Ubuntu from an ISO image
113402
Assembling 32-bit binaries on a 64-bit system (GNU toolchain)
125397
Determine whether or not I can install a 64-bit operating system (Linux) from the BIOS
74079
How to Upgrade Ubuntu 12.04.2, 12.04.3 to 12.04.4, the next Hardware Enablement Stack?
32321
Quick way to tell if an installed application is 64-bit or 32-bit
20399
How do I upgrade from 14.04 LTS to 16.04.1 LTS?
35093
Upgrading from the command line?
113056
How to upgrade from 12.04 to 12.10 using CD?
44047
How do I get 16-bit programs to work on a 64-bit Windows?
10709
Can i upgrade ubuntu without losing my apps and files?
8936
How do I install a 32-bit proprietary deb on a 64-bit system without causing dependency problems?
98421
How will people upgrade from 12.10 to later releases after 13.04 is EOL?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
125207
Run 32bit applications on Windows 10 64 Bit
61432
Why is there no 32 bit ISO for the new Ubuntu 18.04?
125976
What Happens When I Upgrade Ubuntu?