Normal installation pops up an error box saying:

Error during installation process (qt.qt6.600.gcc_64):

The output of

/home/graphics/Qt/6.0.0/gcc_64/bin/qmake -query

is not parseable. Please file a bugreport with this dialog https://bugreports.qt.io.

output: ""

trying on terminal:

~/Qt$ ./6.0.0/gcc_64/bin/qmake -query
./6.0.0/gcc_64/bin/qmake: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by ./6.0.0/gcc_64/bin/qmake)

 

~/Qt$ ldd ./6.0.0/gcc_64/bin/qmake
./6.0.0/gcc_64/bin/qmake: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by ./6.0.0/gcc_64/bin/qmake)
linux-vdso.so.1 (0x00007fffdbfe1000)
libstdc+.so.6 => /usr/lib/x86_64-linux-gnu/libstdc+.so.6 (0x00007f6b61a53000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f6b616b5000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f6b6149d000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f6b610ac000)

 

dpkg -l | grep glib2.0
ii libglib2.0-0:amd64 2.56.4-0ubuntu0.18.04.6 ...