Installation troubles on Ubuntu 16.04-18.x with xampp

Yes, it was one of the reasons.
Now I can't login. Tried (admin/admin and Admin/Admin). The fresh trace from the log:

2020-01-20 14:34:27.332 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:34:27.332 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:34:27.332 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:34:27.415 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:34:27.415 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='admin' and user.isUser = '1'
2020-01-20 14:34:27.415 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:34:27.415 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:34:27.415 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:34:27.415 ===== TRACE ===== Login error for user 'admin'
2020-01-20 14:34:37.660 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:34:37.660 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:34:37.660 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:34:37.716 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:34:37.716 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='admin' and user.isUser = '1'
2020-01-20 14:34:37.716 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:34:37.716 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:34:37.716 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:34:37.716 ===== TRACE ===== Login error for user 'admin'
2020-01-20 14:34:45.430 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:34:45.430 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:34:45.430 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:34:45.519 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:34:45.519 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='Admin' and user.isUser = '1'
2020-01-20 14:34:45.519 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:34:45.519 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:34:45.519 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:34:45.519 ===== TRACE ===== Login error for user 'Admin'
2020-01-20 14:34:56.967 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:34:56.968 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:34:56.968 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:34:57.043 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:34:57.043 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='Admin' and user.isUser = '1'
2020-01-20 14:34:57.043 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:34:57.043 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:34:57.043 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:34:57.043 ===== TRACE ===== Login error for user 'Admin'
2020-01-20 14:35:01.672 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:35:01.672 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:35:01.672 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:35:01.728 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:35:01.728 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='admin' and user.isUser = '1'
2020-01-20 14:35:01.728 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:35:01.728 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:35:01.728 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:35:01.728 ===== TRACE ===== Login error for user 'admin'
2020-01-20 14:35:05.070 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:35:05.070 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:35:05.070 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:35:05.112 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:35:05.112 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='admin' and user.isUser = '1'
2020-01-20 14:35:05.112 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:35:05.112 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:35:05.112 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:35:05.112 ===== TRACE ===== Login error for user 'admin'
2020-01-20 14:35:11.415 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:35:11.416 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:35:11.416 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:35:11.490 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:35:11.490 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='Admin' and user.isUser = '1'
2020-01-20 14:35:11.490 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:35:11.490 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:35:11.490 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:35:11.490 ===== TRACE ===== Login error for user 'Admin'
2020-01-20 14:35:16.442 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'idLanguage' for Class 'User' : field 'idLanguage' not found in Database.
2020-01-20 14:35:16.447 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'isEmployee' for Class 'User' : field 'isEmployee' not found in Database.
2020-01-20 14:35:16.447 ***** ERROR ***** [V0.0.0] Error on SqlElement to get 'startDate' for Class 'User' : field 'startDate' not found in Database.
2020-01-20 14:35:16.521 ***** ERROR ***** [V0.0.0] Exception-[42S02] SQLSTATE[42S02]: Base table or view not found: 1146 Table 'projeqtor.user' doesn't exist
2020-01-20 14:35:16.521 ***** ERROR ***** [V0.0.0] For query : select * from user where user.name='Admin' and user.isUser = '1'
2020-01-20 14:35:16.521 ***** ERROR ***** [V0.0.0] Strack trace :
2020-01-20 14:35:16.521 ***** ERROR ***** [V0.0.0] #0 Sql->query called at [/opt/lampp/htdocs/model/persistence/SqlElement.php:2485]
2020-01-20 14:35:16.521 ***** ERROR ***** [V0.0.0] #1 SqlElement->getSqlElementsFromCriteria called at [/opt/lampp/htdocs/tool/loginCheck.php:67]
2020-01-20 14:35:16.521 ===== TRACE ===== Login error for user 'Admin'

I

Do I have to create db users, tables manually? Any migrations?

Yes, it works for clean installation. Thanks a lot, @babynus!!!