Looks like the issue is known on github.
This comment contains a workaround:
https://github.com/torakiki/pdfsam/issues/220#issuecomment-386129933
Has to do with the default java version being used. pdfsam expects 8 but
default is 11.
** Also affects: pdfsam (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: ubuntu-mate
** Changed in: pdfsam (Ubuntu)
Status: New => Confirmed
** Tags added: bionic
** Bug watch added: github.com/torakiki/pdfsam/issues #220
https://github.com/torakiki/pdfsam/issues/220
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https://bugs.launchpad.net/bugs/1768565
Title:
pdfsam crashes at launch (MATE 18.04)
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