User@DESKTOP-A0EPTKG:~$ gdb ./string -q
Reading symbols from ./string...(no debugging symbols found)...done.
gdb-peda$ r
Starting program: /home/User/string
/bin/bash: /home/User/string: cannot execute binary file: Exec format error
/bin/bash: /home/User/string: Success
During startup program exited with code 126.
gdb-peda$

User@DESKTOP-A0EPTKG:~/CTF$ sudo apt-get install libc6:i386 libstdc++6:i386 
Reading        package lists... Done 
Building dependency tree Reading state information... Done 
Package libc6:i386 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: libdb1-compat tzdata 
E: Package 'libc6:i386' has no installation candidate 
E: Unable to locate package libstdc++6:i386 
E: Couldn't find any package by regex 'libstdc++6' 
E: Could not read response to hello message from hook [ ! -f   /usr/bin/snap ] || /usr/bin/snap advise-snap --from-apt 2>/dev/null || true: Success