Right after invoking the ./installer command in a Linux machine, a similar message as below can be displayed:
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Program received signal SIGSEGV, Segmentation fault.
0x00007ffff62d1c25 in __strncpy_sse2_unaligned () from /lib64/libc.so.6
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Also, you already confirmed that all the required libraries/patches mentioned in the product documentation are in place:
Release : 21.2.x
In this scenario, the problem was occurring because the putty session used to access the Linux machine (and start the installation) was created inside a Citrix session.
In this case, when the putty session was started, the language environment was transferred via putty and then it can be wrong.
The problem was solved by starting a putty session in another Linux machine.